Odd behavior

[Syphon]

I recently just got a baby boa constrictor, who for the most part has been behaving normally. The one thing that is concerning me, is that she shoves herself into a specific corner of her tank instead of hiding in one of her 2 hides. She has 1 hide on the hot side and 1 on the cool side, but she insists on shoving herself between her hide and the corner and she stays there, even during the day. The first day and a half she switched between staying in the corner and exploring but now she just stays there. Her hot spot is about 88F and the ambient temp is about 85F to 75F hot to cool. Temps are controlled with thermostats, humidity stays around 60%. She’s in a 20 gallon, and is on a mix of eco earth and cypress mulch. Is there any reason for this strange behavior?? Why won’t she use her hides?? And should I be worried or is she just stressed?