Feeding frustration

I’m so upset whenever it comes to feeding. My LO does not hv tongue tied. She’s feeding well for most feeds in the later part of the morning to early afternoon. It frustrates me whenever her feeds are after her STTN. She just refuse to drink. It’s so worrying because she’s only 3 months old and can go up to 10hrs without milk. Usually by the ninth hour she will drink. I try to feed her at the seven hour mark but she just spits all out. Help me please!!