Buy a higher output heat mat, or place her in a room with a higher ambient temp.
Inverts burrow to escape heat, so if for whatever reason the tank overheats and you have the mat on the side, she will find cooler subby below her, if the tank overheats with the mat underneath, she will cook herself.
Nice setup
okey doke!
will leave it as it is then! she knows where the heat is!