Where does your daughter live? Would it be possible to get her to move to where you are so that she at least has family support?
First of all, please tell your daughter that this is a phase her daughter is going through and it will pass. I know it's hurtful. But I've been doing this for 21 years so I think I might have some insight. Whenever I've seen kids that are biting other kids and rejecting their mothers, it usually is at a time where their behavior overall is crying out for help. The little girl is really missing her mother and wants her. But she is so upset by the time her mother comes that she doesn't know how to show her mom anymore that she misses her. She's mad because the days seem long to her.
Your daughter needs to find a way to spend some quality time with her little one and maybe even back off on the dicipline for awhile. No one wants to feel like they are raising a brat. But sometimes we just need to love on them. After all, they are just little and don't understand work and time and bills. Even if she likes the daycare she is in, she may still get tired of being there everyday. Sometimes this is evident by watching the kids and observing their behavior over the course of a week. Many of the kids come in a bit grumpy on Monday morning because they were passed around at relatives and had a lot of attention. It can be hard for them to go back to being part of a group. So Tuesday and Wednessday may be their best days at daycare. But if they had a fairly normal or non eventual weekend, they may come in bright eyed and bushy tailed and ready to play. They may be happier on the first couple of days and increasingly grumpy by the end of the week.
One of my moms just called me and told me that she's playing hookie this morning. I'd say all my moms do that from time to time. On those days they just spend some time with their kids and I always see a big difference in their overall attitudes. Moms need a break too.
If this job is stressing her out it may be time to find another and if money is too tight, she may need to find another young mom to live with and share lifes struggles with. They could take their kids to the same daycare, exchange babysitting services nights and weekends or even exchange daycare period if they work opposite shifts. Sometimes we just need to be creative to survive in this world.
Suzi