Older rabbit

Hello
I need some advice, my seven year old lop has slowed down and sleeping a lot, lost a bit of weight (has been vet checked, told it's her age).

All she wants to do is relax somewhere comfy and eat. She is struggling a lot with the heat (lives outside) and is obviously uncomfortable outside, also she hasn't been cleaning herself so is attracting flies and I am terrified she will get fly strike.

Have brought her in and is in an indoor cage, it's not very big but she seems quite content and is the most relaxed she has been in a while and away from flies.

The problem however is that she lives with a male cross who is very lively and gets bored easily, they are attached at the hip and he hates being in the cage, as suspected. They normally live in a ten foot run with hutch outside with free range of my garden when I'm home so he is used to space.

Do I separate them? Do I make the male stay in the too small cage to stay with the female? Or do I put them both back outside in the big hutch?
Please help!