Hello Katiedid1976

,
Sorry to read about the bad time you have had recently.
How about seeing if you sister and your family with go to your therapist with you? Where your therapist can explain a bit about Bipolar.
Possibly your sister is feeling somewhat overwheelmed and concerned for you. She does not have a clue how to help you should this situation possibly repeat itself. Plus she may feel she has no control over it. (there is no reason why it should be repeated)
What some famiies and friends of those with Bipolar have done is to prepare a plan. Once on of the family or friends see the bipolar symtoms become more pronounced, or worrying they can start the processes of the plan.
This way family and friends know what is the best thing to do for the person with Bipolar (and incidently feel like they are helping have some control) and another most important thing is that you also know what the plan is.
The plan would need to be agreed upon by all parties concerned.
A professional who is used to Bipolar (most likely your current therapist) can devise such a plan.
All the best, with your family,
JennyRobin