Hello there, may I help you? You are in a difficult situation here, not wanting to see your daughter struggling but also wanting her to be independant and learn to manage her own money.
She does need to learn to stand on here own two feet and you are doing the right thing by not giving in to her.
If she has over stretched herself she will perhaps have to consider getting a saturday job to cover her expenses. Offer to help her with budgeting as her Dad has done but that has to be all.
Here is an article I found which may be of interest to you. http://www.mind.org.uk/help/social_factors/managing_money.
If you continue to keep helping her she is never going to learn to cope without you bailing her out when things get difficult.
Funding her medicine is fine but that has to be all. She will thank you in the long run, even though it's very hard.
Just continue to guide and support, provide advise and help without financial support.
She is an adult and has to learn that life is not always easy.