Possibly, but it's slight. I can't see it causing any major problems.
Really if her hind end was bulked up a little more, it wouldn't even be noticeable at all. When she's older, it may give her problems, especially if she gets a little sway backed with age, as it'd cause her spine to go in several different angles.
Just make sure she always gets a good warm up to give her back time, and just watch her. If she starts acting tender at all through the years, a chiropracter could give you some good advice.
"You're just as sane as I am."~Luna Lovegood.