Part of what you want to watch out for with tail kinking is also where exactly it is and if what the gecko has is actually floppy tail syndrome. Floppy tail can be caused due to lack of calcium and/or other nutrients but it can also be caused by the gecko hanging upside down or face down. The weight of the tail eventually breaks the vertebrae that connects it to the spine, causing a dip in the spine at that point. FTS caused by the gecko hanging upside down is really of no concern and the female should be able to breed just fine unless bending or curving of the base of the spine has occured. This can impair egg laying and cause the gecko to become egg bound if the curve is severe enough that eggs cannot pass through her cervix.

If you aren't concerned with breeding this particular gecko, the kink shouldn't be of too much concern unless it has been caused by an improper diet. If this is the case, regardless of what you plan to do with her you will need to make sure that she receives a proper diet of CGD (with no baby food or anything else added to it) and insects that have been gut-loaded and dusted with a good calcium and multivitamin.