Chocolate....I'm worried

Hello, It's been awhile since last I was here...I drive a truck now and only get home ever now and then..well I got home this evening to find that Presley had consumed an entire bag of easter chocolate..I really have no way of knowing just how much she ate...My son called me last night and said she was sick and had been shaking....well she shakes and twitches sometimes when she dreams..so I told him its normal..he DID NOT tell me about the chocolate...it has now been 8 - 12 hours since she ate it... I noticed her shaking earlier today when I got home..but just found out about the candy..well my vet is closed right now...we have a 24 hour Emergency pet hospital here in town...and I have to go back out on the road in the morning..I dont know what I should do..she is here beside me asleep at the moment and seems ok... I am worried about here....will it pass? or get worse? seemed like last night was really hard on her as I am hearing about it now after the fact...any info would be great