Old girl doesn't jump like she used to 🥺

I have a chin that absolutely loves to run on the wheel but is very timid when it comes to hopping from ledges. She's at least 15yrs and I'm thinking of buying a pet ramp so she can comfortably come out for playtimes.

Have you experienced anything similar with your aging chinchillas? Could she just be scared and need to be "trained" to hop again? She seems physically comfortable/happy when running on the wheel & taking dust baths.