Get some serious foam material, gardening pads, exercise mats, stuff that doesn't compress easily. Duct-tape that under the back half of the foot, to elevate the toe of the ground. I used to double up on the heel, to have protection for the toe, but still elevated, and could do a boot type of thing out of duct tape. I took them off for the night, cut them open on the front, and put them back on next day, taping the slit I cut shut, adding a layer of foam underneath if necessary. I hope that makes sense lol.
If she's comfy enough to walk around with these, she should be okay for trimming, too, with them on the supporting foot. If she's still too sore, stand her on a blanket, folded for more cushioning. Distract her while trimming. I cut carrots in small pieces and had several in hand, but gave only one when it got ouchy.
It's very very important to get that first proper trim done ASAP