Carol would probably be a good choice.
I'd still breed her to an anery A first.
Say you breed her to a normal. Are you going to sell any of those animals, or keep them all. If you sell them... well, how do you price them? They *might* be something new!.... but they might also be something really common.
If you breed her to an anery A and get normals, then you're starting to get somewhere. If the caramel makes normals as well, you probably have something really new on your hands.
However, odds are this is anery A. So her first breeding you have a good chance of having figured her out genetically immediately.
There was someone else with a wild caught male, truly stunning high contrast individual. Bred this male to normal females first, sold off the babies for a lot more than 'normal het anery' would go for. Next year? He proved to be anery A.
Eventually there is going to be a 'mixing' of the anery types. That's how charcoal was proven and why no few of them are het anery. It also gives you a good chance, if she is something new, to look for neonatal differences.