Jacquetta, for 6 years your mother's needs have demanded a lot of attention and you and your father have given your love and time to keep Mum at home. She has been centre stage in your home and your lives have adapted around her and her needs so it is natural that now she is not there you feel lost, bereaved and doubting if you have taken the right path......
Let me tell you, you have. From what you have written Mum needed far more than you and Dad could provide for any length of time. As the previous poster has said your relationship now with Mum will be as a loving daughter, not a carer. She is not far away, you can visit her as often as you like. You know you didn't make that decision till you absolutely had to. You will read from other posters here that from time to time you will feel guilty but that is only natural. Don't let guilt obscure the fact that you have acted in her best interest.