Why is my female so small?

[links.and.waves]

I got two beardies from a friend who couldn't keep them anymore, at the time she thought they were both males, come to find out I have a male and female.
The female (Who I called Rango, I guess I'll need to find a more feminine name ) is in a 30 gal. tank. Way too small, I'm currently looking for a new tank for her.
The male, Gonzo, is in a 55 gal.
Now, he's around 18 inches, I don't know either of their exact ages.
The female is around 16 inches give or take.
Side by side they look pretty close to the same length, but she's much smaller in actual size.
I was wondering if maybe her tank could be the reason she's not growing?
As for her lighting and heat, I have a 150w ZooMed basking light and a ReptiSun 5.0 26w UVB light for her (not the coiled bulb)
I let them soak every other day, and mist them everyday.
For their diet I give them as many dusted crickets as they can eat within 15 minutes once or twice a day, as well as collard greens, watercress, mango or papaya, and butternut or acorn squash. They eat very well.
I've had her for three months exactly, and right now she's actually going through her first shed since I've gotten her.
Is she at a normal size, or is something stunting her growth?
Any and all advice is much appreciated! I'll try to upload a photo of both of them so you can see the size difference.

 

[links.and.waves]

Here's a picture of them side by side, don't worry, they weren't together long enough to even realize there was another beardie, haha

 

[Hdrydr31]

Were they housed together before you got them? She looks younger then the male size wise.

 

[PatsyB]

They all grow at different rates. Since you don't know their exact age the male could be a little older than the female. Its also possible as she was growing she didn't get the proper UVB or heat that she needed. It sounds like you are on the right track with her. You never know, she may have a growth spurt. My girl stayed the same length for months and then all the sudden grew another inch.

Keep in mind with the UVB, Ideally you want it to cover 2/3rd's of the tank for them to get the best benefit. A bulb like the one you are using just kinda concentrates the UVB to one spot of the tank. Also, if you are bathing them you don't need to mist them every day. Misting them can lead to respiratory infections.