Some horses are very stoical, and some are "hothouse flowers." They let you know if they have the slightest "owie." One of my horses is like that (mostly TB) and the other, who has many health issues, is always forward and on the go.
I suggest you continue asking your horse to come with you, without making an issue of it, but trying to increase the amount of disomfort your horse can tolerate. I don't mean riding her if she's limping; but she CAN learn to live with some discomfort. (As we age, I believe we all do! It's just one of those things.) The thing you're looking for is her feeling better at the END of a session than when starting out. She'll remember this.