Glad you are seeing improvement. If you can order from Amazon Look for Durvet Liquid B complex. I have ordered from them this brand.
Some years back a member was seeing lameness[weak legs] in some of her ducklings and being she is a scientist she decided to do research and found liquid b complex...
When you say plasters do you mean you have hobbled her legs in the proper position?
Doesn't sound like you are in the USA? can you get Liquid B complex? Liquid B complex seems to help with leg issues better than just niacin by itself. you start with half a ml and by week two up the dose to 1 ml...