5 months old fracture and she is still limping !?! You should have been to a vet long back for proper follow ups. Did you just stop with the treatment and follow up once the cast was off? And don't self medicate her on calcium.If you have been over doing that for 5 months calcium overdose too can cause problems.
Get immediate medical advise before the problem worsens, especially since it happened at a young age it may lead to permanent damage if not treated.