I've got a positive story about staying in the family home but whilst positive for the parent, I can't pretend it wasn't hard for me. I basically gave up my normal life to move in with them and initially provide things like cooking. Later it became more 'caring' intensive so I needed help and was responsible for organising and paying carers.
All in all it was great for my parent who had a very happy and settled existence and all the benefits of being in their home of decades, someone they loved around them and was very looked after. I got to spend a huge amount of quality time with them towards the end of their life with someone I adored and loved hugely so it was good for me too in many ways. Very challenging though and I can't pretend it was easy.
All said and done, I'm very proud of what I achieved and it was worth it - but this isn't for everyone. Not everyone would be capable of doing what I did - and I mean that in all senses of the word. Capable in the sense of being able practically to move your life and job; in the sense of being willing to do it; in the sense of being physically tough enough; in the sense of being emotionally strong enough and being capable of keeping going through the dark times of isolation when you feel you can't cope. What care for an individual in their home involves will also depend hugely on the care needs of the individual.
A person with higher needs will have a better time if there is money to pay for their need privately. For example, my parent was having regular visits from a physiotherapist to maintain mobility and ensure they werent becoming house bound.
You need to make adaptations as you go and preferrably before they are needed - grab rails by the loo is there space to have a bed downstairs? where will it go?, is there a downstairs loo? can you adapt it to include a wet room/shower? if not, what about a stair lift or a a hole in the floor conveyor type lift? I was very focussed on having really good quality things to make sure it was all in keeping with the style of the home and home life so it didn't look like a hospital loo!
I would avoid retirement flats esp McCarthy & Stone and similar without much much research. Many turn into a type of service charge scam where you can't sell it after the resident dies or moves out (eg into a nursing home) as they dive in value and you have to keep paying or get repossessed. Google for more on this as there are tons of articles on it but here is an example:
https://www.thisismoney.co.uk/money/news/article-10182583/The-retirement-home-scandal-wiping-life-savings.html
If you are set on it, look for ones where the contract restricts this kind of behaviour or ones where there is a long lease and add on functions are optional and clearly costed with no reservations about using outside services.
If she is 88 and still active, I'd probably inclince to support her staying in her home if that's what she wants. I spent too much time worrying about the future and long term future (full of 'what if X happens and then what will we do?) when in fact realistically once you are over 85, you are in the top percentiles of the survivors and (sadly) you are very unlikely to be needing to look at a 10 year plan.
Best wishes for whatever you decide.