I can't solve the central problem - that her feet are still growing. Solutions to that are way too drastic.
But
1. Try removing the insoles altogether. They may be lightly glued in, which means you have to pull harder. That makes a lot of extra space inside the boot.
If there is anything rough or pointy on the bottom of the boot, you will at least need to insert something thick enough to prevent imprint or injury on the bottom of the foot. Trace the old insole onto a piece of thick paper or cardboard, then cut to the same shape.
You may need to add tape or Moleskin (or other adhesive foam) in spots to the underside of your substitute insoles to provide any support she needs under her arches.
2. Make sure she heats the boots under a bathroom hand drier or with a hair drier just before putting them on, so they conform better. That's a big deal.
3. Also consider thinner socks, or wearing none inside the boots, though not everyone is comfy and healthy barefoot. Plus, barefoot may make the boots stink, and reduce resell value - but it may let her keep the boots a little longer.
4. If I were you, I would get boots that are a little too big next time (1/2 size, maybe almost a full size), and add an extra pair of insoles from a dollar store for now (re-cut to fit, as above) to take up the space. After all, by the time the ordered boots come, she will already have grown a sizable fraction of a half size again.
5. Ask coaches and other skaters whether they know anyone who just outgrew boots about your DD's size. Maybe someone's used boots will be good for her. Not super-likely, but you might get lucky.
6. Now, if only she was a world class skater who could get free boots and blades from the manufacturers, or a skate coach who could get discounts. Tell her to win Nationals before the next time she needs skates!
(Too bad she will need several pairs of boots before Nationals.)
Good luck.