Still put a request into FDC for both the girls. When a position comes up for them both then take it.

She is being very unfair. In the mean time I would be putting in writing what you expect from her, employed hours, what you supply for food each week and other costs. This will also include 24 hours in writing if she wants to swap and no payment for sick days or holidays. Then get her to sign it.

She needs to remember she is not the boss but employed by you. You have been very good to her and she should be thankful.

Also, let your boss know you are looking for a new carer so he knows what is happening. You never know what the outcome might be.