Please take her to the vet ASAP.
These are obviously not normal behaviors for a two year old dog. There are many possibilities as to what may be wrong with her which can be addressed by an exam, bloodwork and X-rays, if necessary.
if you pick her up and she just lays back down or limps like she is in pain 99% possitive that its lymes. Get her tested asap this can kill her if not treated.
let me know what u find out