Yes. Genetic black backs (in my opinion) aren't a true morph. It's just a trait for a nice black line down the back. You can also have black backs that aren't genetic and are just random. It's not even on the WOBP list...so I generally don't give it much credit.
I guess I think it's a lot like a reduced pattern. Reduced pattern isn't really a true morph, but sometimes the lack of alien heads can be passed on to the offspring. Does that make sense?
You can try to sell her for more, but I just don't think you'll get that much. The only way I would pay any more for her is if she was larger and locking with a male. Then I might pay closer to $200.