2 naps to 1 nap at 12 months?

[Aspenn17]

My DD goes down for her morning nap really well, but is starting to completely refuse her 2nd nap. This means some days she is awake from 11.30am-7pm! Any advice? Do I just go with it and try to push her morning nap back to make it one long one? Is 12 months too young for 1 nap? And if she does keep doing 1 nap how do I get that nap to be later and for longer?

Normal timings are...
6.30 am wake up
10.30-11.30am nap
3.30-4.30pm nap (used to be!!)
7.30pm bedtime

Keen to get her back into a good routine as I’m going back to work part time soon and grandparents will be looking after her.

Mine dropped his second nap at 9 months..

He did:
7/7:30 wake up
11:00 early lunch
11:30-13:30 nap
18:30 bedtime

Then we edged forward the nap by 5 mins every couple of days until lunch was at 11:45 and nap 12:30-14:30.

My LO started doing this around 10 months we used to have
7am wake up
10-30 - 12pm nap
2-30 - 3-30 nap
7pm bed

He dropped his 2nd nap about 2 months ago and he turned one last week. I wasn't sure if this was a new routine or just a phase as my friends kids who are 2+ still have 2 naps. I would just see what happens for a few weeks, mine actually had a nap today but we had a bad night with teething so it just depends. He's quite happy with just the one nap though.
Is DD handling it well or being really grotty?

I do have to keep DS entertained from 5-30 onwards as he gets a bit mardy but decided to keep his bedtime the same as I didn't want his routine completely screwing up.

My 14 month old's schedule looks like this:
Wake 6am, breakfast etc.
30 min nap between 9 and 10am.
Lunch at 11.30.
Nap after lunch for 1-2 hours (so 12:30-14:00ish)
Go up to bed at 19:00.
Asleep by 19:30.

He can go without his morning nap but then tends to fall asleep on the way back from nursery and then he's up for hours!