Baby refusing to eat

SM

Hi Mamas my 15 week old has been refusing to eat. She usually will eat 5oz (breast milk through bottle) but the last few days she’s been struggling to get through a feed. Yesterday she only took an ounce during one of her feeds. And just now she only took 2oz

She’s also napping for at least 1.5 hours - I usually have to wake her to eat. And pretty much sleeps from 8pm-7am.

Anyone else?? Stressing that she’s not eating