Very overwhelmed

I have been a full time student since fall of 2018, unemployed for now 2 years. I'm also widowed with 4 kids for 5 years. My kids are 19, 15, 13, and 9. Me and my oldest have been looking for a part time jobs, which would give me less time with my children because of my school during the day and work at night. So over the summer my sister in law had asked me if my youngest daughter could go live with them. I saw her point of view and her concern so I let her go over with them. I have missed her alot. And have seen her once in a while. Fast forward to October there were some situations where my sil asked me since my youngest son is following in the footsteps of his older brother if he and my oldest daughter. They are great parents to their 2 boys and to my daughter. I just feel like I'm failing as a parent because I'm struggling to provide for them. I've had to borrow money from family members just to get through the month. I've been thinking about telling her yes for them to go over there but she is going to be starting to homeschool the kids next week. I'm scared that if they do go they will resent me for it later on.