V.A.T.S seems to switch bewteen working properly and not working unless your aiming the gun, i've had it refuse to activte in the H&H Tools building when i tried to use my hunting rifle against a mister handy, then it would'nt work when i fast traveled to Goodsprings and tried to use my 9mm pistol against the gecko that always spawns there and then would'nt work on the friendly bighorners until i aimed the gun, but then it worked just fine in the REPCON Building when i once again used my hunting rifle against a mister handy even when i was'nt aiming the gun.
Then after recurting Veronica to get into the BOS base, she was at 50 HP after fighting the bark scorpions near the base and then after staring the quest there i fast traveled to the Strip and left her in the Lucky 38, but then when i went to the REPCON Building i could still hear her talking about being injured even though she was'nt there it sounded like she was right behind me.