Does anyone else have a BM whose crazy seems to come and go like the phases of the moon?

Let me explain. BM has for the past 11 years seems to go up and down in her crazy behavior. I am sure it is due to her undiagnosed personality disorder(s). What I am most annoyed at is DH's ability to forgot the times that she was bat sh*t crazy and made our lives and the life of SD15 a nightmare. For example when she is "down in the crazy" she starts with the phone calls about how she hates her life, SD15 is uncontrollable, and she needs money. I think most of us on here can relate to all of these. Not even 6 months ago she was institutionalized for threatening to kill herself to one of her friends. I also understand that a 15 year old girl who is very concerned about her looks, friends, and most important her cheerleading is going to be very hard to handle for a woman that thinks wearing a bra is getting fancy.

My SD15 is a good kid for the most part she gets good grades, I don't have to worry about her embarrassing us when we leave our home, and is easy to be around. I also only see her EOW so I am one of the lucky ones. Additional time with her seems to get on my nerves. However, SD15 is starting to what all teenage girls do and that is get very involved with her Justin Beiber look a like boyfriend. I have caught a few inappropriate texts and FB messages to "Justin" that I passed on the DH to deal with. They were very sexual in nature and I am pretty sure that she has either lost her virginity or on the verge. I did my duty as a SM and passed along the information to DH which completely busted his "little princess" bubble but after some coaching he did Dad-Up and speak to her about how disappointed he was in her behavior. He did ask me to talk to her about being emotionally ready and making good decisions which I did even though it was uncomfortable for both SD15 and I. I did end that talk on a good note and we both got a laugh at how embarrassing it was for us.

BM now seems to be out of her crazy stage for the past two months or so. Last night I had to listen to my DH and BM laugh on the phone and talk about what they are going to do about SD15. Don’t get me wrong I am happy they are co-parenting but what gets me is he gets off the phone and starts talking about how easy it was to talk to her and that she wasn’t going off on her crazy side stories. He really thinks that she is better now. Apparently, she has started to meditate on a daily basis and that is helping her along with her new found religion Buddhism. I think all of that is great but I warned DH that she comes and goes in waves. This is a woman who decided to raise goats one year, raise Talipia in large plastic bins out of her trailer, and a number of other projects that were going to lift her out of her depression. I can see sometime in the future- SD15 will be out of cheerleading because she did something like not take out the trash, or worse we will get another phone call from SD15 hiding in the closet that her mom is going crazy and could we please come pick her up.

I sincerely hope that Buddhism and meditation are her secret and maybe it’s just me but I can’t forgive and forget all the crazy she brought to our lives in the past that put a strain on our marriage and our family trying to deal with her swing down into the abyss of crazy.