DD is 14 weeks and for the past 3 weeks her sleep has been getting progressively worse.
We are up for the day between 6 and 7am. I try and get her to nap after she has been up for 60-90mins. The problem I have is that it can take me 30-40mins to get her to sleep and then she only sleeps for 10-30 mins.
Bedtime is even worse we start bedtime at 7pm and its normally 11pm before she sleeps. Then wakes every 2 hours for food. She is obviously over tired but I don't know how to break the cycle 
For naps we try rocking in arms and cradle, going in the car, walks in pushchair. Nothing seems to make a difference.
At bedtime I usually feed her (bf) and then try and creep out of bed (we cosleep out of necessity rather than choice) when I think she is asleep. She seems to have a mummy sensor that as soon as I leave she wakes.
I cant continue with going to bed at 7pm, I would like to see DH in the evenings and DD needs more sleep. I don't really want to leave her to cry but am willing to try anything.