Thanks for your post Sally and I certainly encourage you to make more use of our forums - they are great for getting in contact with others.
I think that it is important that you continue to take your Mum out - she obviously really enjoys her time with you and your family. Establishing a regular routine for when she returns to the home may form part of the answer to your challenge. Taking the time to ease her back into the care environment may help address some of her distress and confusion.
Ensure you have plenty of time at the end of your day out. Perhaps in the car you can talk about what normal activites will be happenening when you get back, or have a discussion about what may be on the menu for dinner. This will hopefully begin to orientate her back to home before you even get there.
If possible, spend some time with her upon arrival, perhaps walk her to her room, do a quick tour of the main living areas, and keep your conversation positive and chatty to enable her to feel settled in. You may find that you will need to do this every time as she may not remember having it done previously. I would also ensure that you do not rush the process as stress is the No.1 enemy of memory and this process may be undermined if you rush or get frustrated at repeating yourself.
I can understand that you may find her distress upsetting, but outings can provide such a fantastic change of scene for the person with dementia. Even if your Mum does not remember specific details of outings, she is sure to remember the positive interactions that happen during these times. This can only benefit her social and emotional wellbeing.
You may find some handy communication hints in our article,
5 Universal Emtional Needs.
Do any other members have a special insight into this challenge? Feel free to share your experiences.