Wally - there is one issue that worries me and that is your Lacey is 25 years old, which is a good age for a horse.
When under saddle, jumping three foot up onto a bank without the help of momentum is quite a strain - especially if the rider has not yet learned how to make it easy for the horse. The stress is significant on the ligaments and the joints. I’d be even more worried about her dropping down 3 feet off the bank.
Personally, if I were in your shoes, I would think twice about taking that bank. I’d go the long way round. As a minimum I’d dismount. It is easier to teach her to stand still than it is to ask her at this stage of her life to jump steep banks. But you know this already and what’s more you know your horse far better than anyone else.
The name of the game now for you is to keep her fit for riding for another five years - maybe even more. So the quality of her old age rests with your decisions about what you ask her to do. Your call Wally.