If she can move it but doesn’t put weight on it then I’d really be wanting to look at the bottom of the foot for sores to start with.
If there are none, then I’d be looking/very gently feeling for hot spots, redness, swelling in her foot and in her leg.
I really don’t think trying to splint her foot/leg is a good idea as a splint would usually be used for a break which are certainly not a good idea to treat at home without knowing that the bone is sitting as it should be before the splint is attached, often when people do this at home they cause as much damage as the damage they’re trying to fix, unfortunately this often leaves the bird with a totally unusable leg that often needs to be amputated.
I suggest you make an appointment with your closest AV ASAP. If she isn’t putting weight on it then there is definitely something wrong and she will be in a great deal of pain.