I think her saying she was going to call the police because she was so worried is her own guilt talking. She knows she has not been the Mother she should be and it probably makes her feel better when she says she was really worried and going to call the police. To her she could say to herself see I'm a good Mother. It's really not about you or the job you are doing with S. iMHO. In fact she obviously trusts you are doing a good job with son because she is leaving him with you 95% of the time.
I think your plan to dress for success is a great idea. It will do the world of good to look in the mirror and see yourself looking your best. It is more than depressing to see your self wrapped in a robe all day. A lazy Sunday is one thing but all week is unhealthy. Project what you want to be and where you want to be. It's a positive step. Happy shopping.
Me 52 H 44 T9 M 5 BD 12/11 H split 8/12 OW moved in 12/12 OW gone for good 6/14 We get closer again 9/14 SD 13 Me 4 Grown
Accept what is...let go of what was and have faith in what will be.