Yeah, my daughter can say some words but this is exactly what I mean, she doesn’t ask for food, or particular foods, or request anything just like your girl and I am noticing babies their age doing it, so has me a little worried
So for things like food it was definitely a learned behaviour, I spent a looooong time doing the food sign, literally every single time she got some food and she eventually got the link and learned to indicate that she wanted food. They all make these connections at different stages though, mine is good with communication but behind in gross motor. I think they focus on different things at different times. Maybe yours is just really chilled and it hasn't occurred to her yet that she can order you around and make demands! Maybe try focusing on one need at a time and see what she picks up 😊
Honestly I'd take the use of the word 'asks' with a pinch of salt. For example I would say to my husband "oh she asked to watch bluey today" and what I mean is she shouted the word "BABOOEY" whilst looking at the TV, or she "asks" for food by doing the food sign, or for more with the sign for more. So she can ask for things but usually in a context that only people who know her would understand! As they learn more and more words they'll be able to communicate so much more, it will come in time!