Poodles can be notoriously fussy about food, I had one who'd go days without eating if she didn't like what was on offer 🙄
Try yours on a few different things, more important that it eats than not, they're stubborn enough to dig heels in and get bored easily.
Not suggesting you bombard her!
What raw food do you give her?
In your shoes I would decide on a few different alternatives to try over a couple of weeks.
Give her alternative no 1 for a meal and if she won't eat it, then after a couple of hours take it put some chicken & rice down as well and let her choose what she wants & eat at leisure.
Do you serve food warm or cold? Serving warm can release the aromas and tempt them to eat.
(Even with raw food, I used to heat in the microwave for just a few to 30 seconds for this reason when mine was being especially picky).
Repeat in a couple of days with alt no 2. You want to give enough time to see if she just needs longer to try the new food, and to make sure it's not upset her stomach before offering something else.
And so on.
Does she show interest in what you eat or cook? This can give you clues as to tastes.
Poodles can be sensitive, have you noticed food refusal coinciding with any changes that may have unsettled her? Noisy neighbours, change in when her humans are home or going out, new experiences or exposure during walks & training, etc?
Where and when do you feed her? Where are her bowls located? Are other people around her or is she left alone to eat?
What's her daily routine? There could be clues as to why she's refusing food...
Sometimes they like company and to feel included, so if you're serving her and leaving her to it alone in the kitchen, she might prefer to eat when her family are with her & she feels included.
Or vice versa - she might prefer to eat alone and in the quiet.
When my first poodle got older, he sometimes needed encouragement to start eating. I'd hand feed the first couple of mouthfuls, then his appetite would kick in and he'd be away lol
You could also try feeding little & often instead of 1 or 2 larger meals. Some pets, like humans, can find a plateful/bowl full a bit daunting and prefer smaller amounts...Yours might be a grazer.
If raw & home cooked foods really won't entice her, then don't be too afraid to buy some pre-prepared shop bought dog foods. It's more important that she eats something, just buy the highest quality you can afford.
You could also try mixing the chicken & rice with a bit of a kibble or other raw/home cooked food too to encourage her to eat it.
Have you tried giving food in a toy like a Kong?
Speak to your local butcher about a lamb bone or some offal. I've yet to own a dog that didn't go potty for liver.