This sleep lark just seems to be going from bad to worse

The day after I last posted she had a 30 min sleep in the morning followed by 2 hours (first 30 min in her cot then me holding her) and I thought great, this is looking a bit more positive, even if I did have to hold her. But since then she's managing 30 mins tops in her cot and will sometimes go back to sleep if I hold her, or else I'm having to drive her around, and that doesn't always work either.

I'm sitting in her room holding her now, she's been asleep for an hour, but i haven't been able to put her back in her cot since he woke after 20 mins. Last night it took me 1h20m to put her to bed and I came out of her room and cried with frustration. DH is back now, I know controlled crying is on the tip of his tongue, but I think he knows that my reaction to that wouldn't be pretty! My friend reckons it's still a reaction to the mmr, as most kids we know had a reaction around the 10 days to 2 weeks mark.

I started a food/activity diary this morning to see if I could see any patterns, but other than that I'm stuck.

If you've read this far, thanks for listening! Not sure if anyone cn suggest anything else, I'm just venting really I think