I had a really hard time going thru the early teenage stages as it is a time of trying to identify who you are. A natural part of the process is to compare yourself to your same sex parent. I am sure your D is looking at your W as someone who she doesn't respect and doesn't want to grow up to emulate. It is tough when the a parent you looked up to has disappointed you so greatly. Continue to be there for her. Keep communication open and give her quiet moments with you so that she can speak up if she feels like it.
W has messed up, but you need to move forward. Dwelling on her mess up only leaves you stagnate. She is not the same woman (and I know you want the old woman back) - but she isn't coming back any time soon. This is the new reality.
I think it is great that you took 4 teenage girls shopping! I loathe shopping as a hobby for teenagers (I would prefer the girls to be active with sport or around their ponies); however shopping is an important part of being a teenager and fitting in. I do support my girls going shopping. Your daughter needs to spend time with her friends. It is important she is able to just laugh and relax, too. Well done for being so patient! Is it possible to arrange a sleepover with any of the girls at yours?
Your children will never completely understand the financial sacrifice you are going thru; however they will always remember your love and the time you took with them. Which is far more important.
What's next for YOU?!
H: 48 Me: 47 Married: 19 yrs T: 20 yrs 2 teen-Ds and S H-MLC (started 2012) and H-Unemployed (11/2014) D-Bomb: 2/2015 H left country but hasn't moved out: 7/2015 I filed: 7/2015