My DD is 10m and has always been an awful daytime napper. I have pretty much given up with it. She would sometimes nap if out in the pushchair but won't even do that these days. I have recently been able to get her to have a short morning nap in her cot, but not always, and can still not get her to have an afternoon nap. Even if she's getting cranky, yawning, eye-rubbing etc. she just won't go to sleep.
TIA