Just a thought, OddBob, but perhaps you should spend more time thinking about and defining YOUR boundaries regarding the impact that her addictions & related behavior have on your well-being and health. If she gets clean and stays clean, perhaps you can work out a healthy relationship, but that is a long time from today.
It may be wiser to spend your energy on your mother and her needs right now, and get a bit of space from your AGF. The last thing I would do is bring her somewhere right now. Imagine your mom seeing addiction, withdrawals, related behavior issues, etc. during what is supposed to be a friendly visit for her sake. Maybe spend a moment imagining the best and worst case scenarios for the trip and make your plans carefully, with you and your mom's best interests in mind. Two weeks is a long time with an active addict--anything can happen between now and then and it is best not to make plans with someone in active addiction.
My heart goes out to you--I hope you find some peace and clarity.