Peanut butter. First I might put ice on it to harden it up and pick as much off as you can that way. Then, rub peanut butter on it and that softens it up. If it is on her foot she likely doesn't have too long of hair there, right? You could cut a bit of it away just be super careful not to cut skin. I hate it when that stuff happens.
Yep - peanut butter. The upside is that there is no reason for concern if/when the pupster licks at it afterwards as there would be with some other options. Use ice with caution with respect to the pads/skin.