If your daughter has only recently completed her degree she is probably still at the stage of feeling she knows it all and knows your feelings and business better than you. Immature, yes, but a phase that will pass.
Do what you want to do.
If she refers to the matter again, either ignore, or ask why your decision bothers her.
Presumably, she feels that no woman living alone, should let total strangers into her house if indeed that is what you meant by doing AirBand B. I assume if you are intending to run a B&B you have fitted locks to the doors of your private appartments and have a good safe to keep money in.
If what you meant was going away and staying in B&Bs then her objections are far less reasonable.
In either case, do not let her dictate to you how you should plan your life or spend your time.