Help! Yellow fungus (?) reduced appetite

https://imgur.com/a/5G605Bs

Heres my beardie. She's about a year and a half old and I've lately noticed a lot of rough dark patches on her belly.

She was never a strong eater (taking maybe 10 cockroaches a day when growing! But 4 or 5 a day now and sometimes none at all) but recently she's gone off her veg. I've had her checked up at the vet (exotic specialist) a couple times and they did bloods and nothing up with her other than a mild worm infection when we first got her. Bloods have always been fine. She even had an ultrasound and they only noticed that her liver was apparently weirdly round but they couldn't find anything actually wrong.

Recently she just ignores her veg and fruit. I can pop it in her mouth for her and then she will eat it, but she won't willingly eat it. I'm concerned becahse her diet is now basically entirely live food and she's an adult so I'm worried. I've also noticed this patch on her belly.

What's up with the patch? Does she look underweight? She's always been small, about 19 inches and weighs about 430g...

I am just worried about my baby. She's been hyperactive lately. Calcium and multivitamin with foods and has a t5 bulb as well as a mercury vapor basking bulb. Check my previous posts for set up. All help appreciated.

No fungus, just discolored scales which some dragons develop. I can't really judge her size, can you post a few pics of her from above to show her full body ? Her length + weight sound good, on the lean side but not unhealthy. If she's very hyper it may be breeding instinct or even carrying infertile eggs. Can you post pics of her tank + lights also ?

https://imgur.com/a/tL8TnQq

Heres her set up. I removed her hide here but she usually has a cave as well. I'm aware it's a little low and it's the minimum size really for an adult beardie. I'm going to upgrade her living arrangements very soon also. The bulbs are both changed in the last year, the T5 is going to be changed soon again.

I've given her sand to dig in and she does love digging long caves and caverns but she never seems to lay and feeling her belly I don't feel any eggs. She poops regularly too.

https://imgur.com/a/X0n59nt
https://imgur.com/a/K4u7frV

Here's some other pics of her. She's a bit moody there, haha.

I feel like she's too skinny but she's always been skinny and has always not been a big eater.

She looks healthy to me based on those photos. Your setup looks good too (i agree with you that it's a bit low) and your Arcadia UVB light is excellent.