The thing was that she wouldn't go down before 15h. She fought like a tiger and I put that down to her having a lovely long restful (!!) sleep in the morning.
She's just gone down at 9.45 again this morning, since she was awake early I didn't push her on to 10, so I'll shoot for 11.15 and then 14.15ish. Fingers crossed. I'm studying while she's napping (except for right now, oops) so the less I have to do for her the better.