High on shrooms? Help please

My sister is 17 came home high from shrooms she wont let me leave her side and my mom went to bed didnt really have a reaction :/ she took it at around 8pm its 10:30 now, is there anyway to make the high go away?? I told her to drink water and try to sleep but she cant sleep. Never done drugs except for weed so I'm not sure how to even help her. She says this is her first time doing shrooms as well.