Keep the water conditions perfect and maybe go through a course of melafix and she should be fine.
Obviously, that is, if it is only from an environmental cause and not from fin-rot or a similar infection.
Realistically, being a new fish there is no way of knowing so go with the melafix but remain very observant for any worsening of the pelvic fins condition.
Keep a close eye on her other fins at this time, also.