Transition to 1 day sleep

Isla still has 2 day sleeps. Recently these have gotten shorter- now 1 hr each, and are happening later. She is up at 6am, and was going down 9.30am, now its around 11am and 2.30pm. Even tho she is often going down in the afternoon close to 3pm, and waking around 4pm, she is still ready for bed at 6.30pm.
So she usually wakes from her am nap around 12ish, and is ready for anothe nap within 2 1/2-3 hrs.
Would one longer midday sleep be better for her?
Will this just happen or should I be doing something?

A bit of history- Isla is natually a poor sleeper, and we have had to do a lot of work to get her sleeping better. She has just started sleeping through the night in the last few weeks.

TIA

Yeah I thought she was doing that, but cos she will only sleep for an hour at 11am,...she so tired she needs anothe one later! Maybe giving her early lunch would help her stay asleep longer cos she might not wake for lunch?!! Who knows?! I just wanna know Im not completely doing the wrong thing, cos Im clueless!

James started to have one sleep a couple of months ago it we were out one day and missed is morning sleep so he went to bed around 12 and slept for 3 hrs so we started on sleep a day from then at first every few days he would have to sleeps. But noe he has the one I give him lunch around 11 and bed at 12 and sleeps around 2-3hrs I also noticed once we changed to 1 sleep he started to sleep better at night again.

Agree with Emma - no wrong thing! Some babies seem to need more sleep than others. Ollie only has one big day sleep now and goes down after he has had his lunch. He sleeps for at least two hours and sometimes up to three. Depending how tired he is in the morning, I give him lunch anytime from 11.40 ish through to 12.30. (Depends what we are doing really) He then goes down for his sleep.
Sometimes he has a catnap in the morning in the buggy when I go for my walk around 8.30 ish.
Hope that helps - think they are all different so whatever suits you and Isla really. : )

Lol Emma! I have high sleep needs, but Isla is yet to co-operate!

Mazzy, up until 3 weeks ago Isla was still waking anywhere up to 6 times a night,...and after having been weaned off night feeds for a few months, she was back to drinking at least 2 full bottles over night, plus her 9.30 pm feed- this was after a period of being sick with 2 ear infections and gastro over a month. So we were going crazy, and after moving, and getting her checked out by a Dr *again*, and advise from plunketline, we got tough!
After bottle and bed at 6.30-7pm, we didnt go back into her til after 6am. The first night she cried a few times, but since then if she wakes, its only for a few mins. Yay!

Lol Fiona! I guess thats the one good thing about having a bad sleeper, I dont miss her good sleeps cos there hasnt been many!

Cos Isla has been such a shocking sleeper, I guess I just need reassurance that this irregular day napping thing is 'normal'! Thanks everyone! I guess we will just have to ride this wave for awhile!

Isla is asleep at the mo. Seemed really tired, so put her to bed 9.30, but she cried for 10 mins til she went to sleep. Must have been tired tho or she wouldnt have given in! Lol!

I guess I have been influencing this change a bit too, cos we have started going to mainly music and a playgroup which both start at 9.30 which was her normal nap time. Hmmmm. But she usually not ready for bed till well after that anyway now.