You'll have to keep pushing out that first A hun. If she's definitely refusing that afternoon CN more often than not, it might be time to make the jump to one nap.
I would hold the 11.30 for another day or so, then push again to perhaps 11.45 or 12 and hold for a week and do an EBT if the nap is less than 2hrs or so.
It gets difficult to apop a quick CN the more you push the first A I found, so EBT worked wonders here. It doesn't work for everyone though and be mindful of how much sleep you're expecting out of them. It's great she does a near 12hr night atm, but if she sleeps 1.5hrs for her nap, then don't try and do too early of a BT as she'll have her 12hrs + 10mims and be awake earlier and earlier. That being said, too much A before BT can cause OT early NW's but that's to be expected when you first transition.
You may find she'll need the odd two nap day to help correct any OT. What worked well here was although we used to do long am, short pm naps that when I wanted to correct any OT or if she woke too early in the morning, I'd do a quick 10mins CN around 9 (might be around 10 for your routine), then did usual nap time 2-2.5hrs later.