Yes, it all makes perfect sense. In fact it sums up perfectly the dilemmas of caring very well. Just bear in mind what is available as and when either your own situation, or your nan's, changes for some reason. Each time mum has had a medical problem, she has been ill, then got better again, but never quite manages to get back to how she was before. Asking for help isn't an admission of failure, it's just that nan has needs which you cannot meet. Feel proud that you are doing a good job caring for nan to the best of your ability.