Yes, the only way to know what she is het for would be to test-breed her.
Since this gecko appears to be Tremper Albino, (to me, anyways) you should not cross albino strains...as in, don't breed it with a Bell or a Rainwater.
what would you suggest to breed her with, any input you have would be great,
not jsut to figure out what she is het for, but what morph would produce the most desirable offspring with her?
You can try with a Diablo Blanco and can verify if she is het, eclipse and blizzard. With a Raptor you can only verify if she is het eclipse and with an ember can verify if she is het raptor and patternless.
breed her with another tremper so you can get more. if you breed her with a raptor, which is tremper and eclipse, you'll test to see if she is het for eclipse or not. if not then your offspring will be trempers het for eclipse ad you can breed them back to each other to make more raptors.