Hello,
I definitely agree, it looks like a bite. Crickets are horrendous & extremely carnivorous. They
will definitely bite if given a chance. Neosporin/polysporin or raw honey on that area should
help a lot.
I am not familiar with that particular MVB, it is a new brand I guess. So, I don't know how good
of quality the UVB is. Perhaps you could keep that but once you get her into a 40 gallon tank,
you can purchase a Reptisun 10 tube or an Arcadia D3 12% tube to complement the MVB.
Tracie