See it as concern and let her know that you are happy with it. The other worries are no different than if you were straight and moving to be with a heterosexual partner.
You can help put her mind at ease by letting her know that you are lucky to have two loves while many people just get one. Let her know that you are grown up and you are making grown up decisions. Sometimes she may disagree and sometimes she may be right. But ultimately, this is your life to live and not hers.