She looks in very good shape to me. Not too fat, not too thin.
The comments of my 'predecessors' are spot on......older ladies don't have the same taut and pert shape of young ones! If my old girls had been sheared (still waiting) I'd take a pic. Prominent hip bones and sunken areas with big bellies and floppy udders. Some of these girls are 10-11 and have had lambs for most of those years and everything has gone south, but they are fit and fine.
Take a feel across the back just below where the ribs end. I'm sure that you'll feel that there is a good covering of meat either side of the central vertebral spine, which itself is not too prominent. You should be able to just about feel the transverse processes of the vertebrae, but there's a good longitudinal band of muscle filling the 'gutter' between the central spine and the transverse process.
If she's in this condition at 'tupping' time, she'll be in ideal shape.(for an older girl).