When you put her down for a nap does she show tired signs or do you just put her down because its ‘time’ for a nap as part of your routine? How many day sleeps does she have and how long? Could it be that she’s getting too much sleep during the day and therefore won’t settle over night? Shoot me down if I’m completely wrong – just throwing questions at ya!
Usually by the time it's time for a sleep (as part of our routine) she's tired anyway and showing signs of the same. She usually has 2-3 daytime sleeps of about an hour but ranging from 1/2hr to 2 1/2 hours. I've thought about the too much sleep during the day thing, but I'm not sure that's possible as if she didn't sleep during the day she'd be overtired (like today) and be hard to settle at night (like now).

I will try what she said tomorrow. I'm going to move her solids to the morning as I think she's too tired at night. She doesn't take much at all so hopefuly she will if she's more awake. That said though, my normally happy baby has just screamed her heart out for the past hour and a bit, so I might see how she goes.