Hi everyone,
I'm back from the vets. They wern't exactly sure what is wrong with her, but they don't think it is because of the frog. They think she may have eaten something in the garden which has given her an upset tummy, or that she may have a blockage. They said she is slightly dehydrated but not dangerously so, they have given me a little syringe to give her water with if she won't drink herself. They don't want me to feed her until tomorrow, only water, and would like to see her back in the morning.
She has just had a big drink of water and kept it down, and is now sleeping next to me. So fingers crossed she is feeling better soon, and I will update you once I have been back to the vets tomorrow.
Thanks for your concern!