I think you are right.. whilst waiting for replies i have tried to watch more closely for overtiredness in the afternoon. If she has good naps all day she is definately more easy to settle at night. I also wondered if her bedtime was too early but 7pm seems quite popular for a lot of babies?? typical day..
7am feed, maybe a bit of chat and a nap for 1.5 - 2 hours - very easy to go down.
10am feed, chat, mobile time and nap - again I am for 1.5 hours nap
1pm feed, activity, may sleep for 1.5 hours or be a bit restless after 1 hour or so
4pm feed, will try to get a cat nap in. if she naps well for 40 mins will bath, and give 3nd feed at 6pm, then swaddle and bed
if she doesnt nap well, i keep activity to a very quiet level and skip the bath and then feed and bed as above.
I have started to swaddle again for each nap and bed, and although she always breaks free i think the sheer routine of it lays the way for sleep. I am also concerned that she may have mild reflux, which might make her more uncomfortable going to bed straight after the 6pm feed. sometimes after a nap she cries and when i pick her up she is rigid from top to toe and I cant make her bend her legs enough to sit - does that sound familiar to anyone?