I guess it depends what you are asking her. If you are asking if she would like some ice cream and shes ignoring you then perhaps have her hearing checked.
If you are asking her to pick up her toys and she shes ignoring you well then you have a child that is stuborn and she sees no point in answering you because what you are asking her to do is something she sees no reason for her to want to do. As she ages you have to teach her that there are implications for not doing as you are told but that will take time.

It could be your tone of voice that uninterests her. Media for young kids generally shows them talking in high pitched silly voices to grab attention and engagement. Perhaps give that a go?

What is she doing when you are asking her a question? If she is completely focused on what she’s doing she may not register that you are speaking to her. I think the trick is to make sure she knows you are talking to her either by touching her shoulder or making sure you are at her level and talking directly to her, also make sure you use her name

Get down to her level, maintain eye contact and speak firmly but kindly.

Whenever u want to handle these kind of issues with ur kids bend ur knees make an eye contact with ur child and then teach them and right before sleep teach them what to want

Maybe try getting down to her level and saying her name.
I always said her name, waited for her to lool at me and touched my chin to draw attention to my mouth when she was having trouble…
I have tried whispering ‘do you want a treat’ and if she flings around, the asked why she didn’t answer me when I spoke to her…
Is she involved in a task that requires full focus?
She will grow out of it, but if you are cincerned, maybe connect witb coommunity health nurse in your area? Pr call 13health and rhwy cam get yoj some numbers. Its only a phone call.

Do you say your daughter’s name to make sure she is aware that you are talking to her? Make sure you are at her height so she is comfortable with you being close to her. Some little ones sometimes feel a bit intimidated if anybody is suddenly right next to them. Encourage her to look at whoever is speaking to her. A friend of mine taught her children by putting one finger about 25 – 30 cm away from her eyes then pointing at her own. That worked a few times. If the TV is on pause it or turn it off if you are ignored. Confiscate electronic gadget if you have to in order to gain her attention. Check whether or not you notice any reaction if you wave your hand or walk across in front of her. If she manages to show no reaction at all there has to be a problem not just you being ignored. Some of this is what we and other parents have been advised by medical professionals to try. One child they discovered was having absence seizures then would come out of them and remember nothing that had happened. The child was just staring into space. other things some do is wander off and have not idea they are doing so, suddenly drop something or hold on to it very tightly. These are only suggestions. None of these may apply to your little one.

Kneel down to their level to speak

Have you had her hearing checked? If that’s not the problem then maybe she just doesn’t understand what you are asking. Try standing in front of her and looking directly at her so she can see you are talking to her alone. Explain to her that it’s very rude to ignore you when you ask her a question. Then next time she asks you a question just ignore her and then ask her how it feels to be ignored

It should improve with time. When asking her a question, focus on her so she can see that the question is directed to her and that you are waiting for an answer. Make her stop what she is doing first so that you have her complete attention.

Have you ever tried ignoring her so she can see how it feels. Or take something away from her until she stops ignoring you

She’s still very young and may struggle to focus and divide her attention. Some things which may help; when you ask her a question come up close to her so she sees your face and can look in the eyes, help her to stop for a moment with what she was busy with so she can focus on you and ask your question in a simple way. I have a 5yr old girl with Down Syndrome who functions on a level of a 2,5yr old. I need to make sure I give simple 1-step instructions and directions because she doesn’t hold her attention for long and is quickly distracted.

We’ve always encouraged “listening ears” and “whole body listening”. See if you can find the Cookie Monster whole body listening video, it worked for us. Basically we repeat “eyes watch, ears listen, voice quiet, body calm” then repeat the question. It encouraged my son to filter out distractions and focus on what I am asking

She is just 2.5years.Try to read lots of books with her.