Daughter is having trouble.

I need some advice. I have a 6 year old daughter that I have basically raised on my own until last year. We had lived at my mom's house until earlier this year. I met a man last year and we got married this May and we are expecting a baby in November. He also has 2 kids (10 yr old girl and 13 yr old boy). I let my daughter go to my mom's house on the weekends that she is off work and when my mom has 1 day off during the week. For the past few months, every time she comes home, she cries and cries and cries. She won't tell me what's wrong or if she does, it changes every few minutes. I feel like she doesn't want to be with me anymore and it's breaking my heart. I suggested to my mom about stopping the weekday visits to see if that would help but I ended up just making my mom mad. She insinuates that I'm a bad mom. That I don't spend any time with her. Etc.... but like I explained to her this morning, financially, my husband and I are struggling very badly. I have to work. But I get off at 4 in the afternoon. Is a bad idea to stop the weekday visits? Would that do more harm than good? I had a breakdown last night because of how long this has been going on and I'm afraid my daughter doesn't want to be with me anymore. Between that, our financial situation, the stress of the baby coming soon and not being able to afford anything (btw, we live in a travel trailer), my blood pressure is starting to get high. I need some advice on how to get her to adjust a little better. Thank you.