What is this

Enclosure and heating is fine I’ve had her for around 40 days but she hasn’t been eating much I do everything by the care guides I have uvb t8 which I’ve heard isn’t good anymore so will be upgrading but will that make a difference in her eating habits I mean b4 the t5 ho was mainstream everyone used t8 so I’m just confused also her behavior is regualr up and climbing around and basking all day and goes to sleep area about an hour before lights out she definitely drinks also but not a big eater I cup feed roaches and crickets although a lot of crickets jump out also she hasn’t shredded yet but I don’t know how often these guys shed and she’s about 4 months old