Does she like him

My son as a girlfriend whos mother is either separated or divorce from her ex I dont know which I have met her twice. The first time she picked up her daughter from our house and the second time at college when the students were getting awards. Her daughter goes to the same college as my son that's how they met. At the college I said hello to her and we were all standing in a circle. She was mostly looking my husbands way even thou I was standing by her and I felt I was invisible and my husband said to me he felt he couldn't talk to her because I would think something was going on. She looked at my husband when she said goodbye not me. I noticed my husband looking her way when walking around. she as turned up today to pick my son up to take him and her daughter to the beach. She knocked on the door not the daughter which I thought was unusual and now im wondering if she did because my husbands car was out side and maybe she was hoping he would answer the door. Me and my husband have been having problems and im wondering if my son as said something to his girlfriend and she as told her mum and her mum is trying to get my husband