My sister has a cow like that. She has been that way for as long as I remember. She must be at least 10 years old and every single one of her calves has either been shown, or retained in the herd. It certainly is not a structural problem she has, maybe was just once injured. She has no problem with proper movement. Will still eat you alive at calving time, and maybe even for a month afterwards. Lol.
If your heifers have problems with general movement, and travelling, I would send them to the sale barn. Also check them out to see if their structure will allow proper room and movement for breeding, and calving. If she seems fine, I would keep her.