She will likely have mood swings for a while but feel better in the long run. Problem is if she's still doing meth then the pot probably helped. It all depends on how her body reacts to it. Some people use it to get up and get going some to unwind some to just get messed up high. How does she use it? Is she still on meth? If so then the pot is the least of your worries. If it does actually help her then maybe a script is the way to go. If she's off all other drugs except the pot it's her last lifeline to her addictions then mentally it's gonna be hard n from my experience as an addict it's gonna be hard to let that go. So along with the pot withdrawals there's just so many other variables that will affect her moods.

No matter how small, a positive change deserves to be celebrated!