As I may have said in your other post, one day I'll have to get me a pair or trio. They are my favorite Jacksons.
As for the horns, I've never seen a female with a straight horn. They are always pointed upward. So your female should be normal, unless I'm mistaken.
I don't see a bad brake in her horn, so it must be just a crack. I've had a Quad come in with all his horns broken and I found that by applying neosporin to the area(s) prevents infection and fungus. My old quad's horns healed quite nicely and is still going strong two years later.
This quad is now in Chad Norton's care, and should be 5 years old or older...still likes to breed at this age, the horny fool.
I wish you luck with her.
Harry