It's up to you, if she's still taking them & has no apparent trouble digesting them, but I probably would. I've had older snakes that still wanted to eat but would
actually refuse larger prey like they used to eat. I think at some point it appears to be a stress on their digestion, or they'll put on too much weight from excess
food they don't need, & that causes issues too, like 'fatty liver'. When their growth & activity clearly slows down, they just don't need as much food, but just like
the rest of us, we're all different, some in better shape for age than others.