Hi UncleFreddy and :welcome:
If your stems look like the one in the picture below, there's a good chance it will continue to grow up from the center and still be quite normal this year. About all that will happen is you'll notice the lower leaves will be short and stubby. However, if it is chewed off all the way down to the white on the stem, it will go to rest until next year.. When this happens the plant will be a little smaller next year with a couple less flowers. You may also find the plant may generate a few extra offsets during this year of resting.
I do not believe squirrels are the culprit, but rather it's a rabbit looking for an early spring salad. Squirrels, as a rule do not like lily foliage. You'll have to make some kind of cage using chicken wire or rabbit fence until there's plenty of other greenery for the bunny to eat and by then it shouldn't bother anymore (hopefully).
