What's her issue with them? Too soft? Too upright? Too hard? Too hot?
For heat I went with beaded seat covers, best thing since sliced bread as they actually work and promote airflow.
Don't forget passenger seat is probably in better Nick than driver's seat because of the same issue (whinging passengers). Might be worth getting some longer seat bases from exmoor trim if you aren't a millionaire. A set of scheelmann seats is like 1700 each. Any custom seat is comparable.
Or you could go full custom and put disco seats or something in there.

