I have a 5.5" female red eared slider who still won't eat plant matter. Everything I've read says she should be, but she'll only take pellets and live feeders. Any ideas. A few shots of her are below:
Have you tried leaving the greens in her tank for a couple days (switching the old ones for new every day, but having a constant supply) without giving her anything else? Mine didn't take to greens at first either, but on the second day without pellets I noticed a couple bites out of her greens, day after that they were gone.
They are quite fond of duckweed as well.