Sometimes she does have a good 1.5 hr nap but then it screws up the whole day (especially the evening) because of the 3 nap thing.... the 3 naps only work with an 8pm bedtime if she has the 30 min naps because she is awake for 3 hours in between.
Yesterday she had a 1.5 hr nap in the morning and a 1 hour nap in the afternoon, woke up at 4pm. Which was great, until I put her to bed at 7.30 and she woke up an hour later wanting to play and I couldn't get her down until nearly 10pm. She wakes up absolutely wired to the moon and will stand up in her cot in her sleeping bag crying, singing and generally carrying on a treat. All she needs is a tin cup so she can rattle it along the bars like a prisoner. If we leave her there she will try to cruise the cot bars, usually resulting in falling over and hitting her head
But thanks for the suggestions, I'll give it a go, especially resettling rather than getting her up in the evening. Sorry if this didn't make much sense, I don't think I'm explaining myself very well!