butterandjam
Well, your dog, and you, both need to give up the idea she can refuse to go out with anyone else. Are you using an extending lead?
She needs to be taken out for solo walks, on a short one metre lead, by an experienced dog walker.
Dog reactivity ? Just tell the walker to stay in quiet areas well away from all other dogs.
The only other alternative is to rehome the dog.
It’s easy to say ‘ stay away from other dogs’ but, in my experience unsupervised dogs can suddenly appear from nowhere with their owners then pointing out that ‘ they’re friendly’ or, your dog is only being reactive because you keep it on a lead
. As for rehoming the dog, just because the OP has limited mobility why should she rehome a dog that she loves? Going out for walks isn’t the most important thing for our dogs; being loved is far more important. Imo