DD1 is very ill at the minute with a temperature ranging from 39.7 to 40.3, we have tried to get her to sip water but she cries and doesn't want it (she is 4), when she had some juice earlier it made her sick, she has not been to the toilet all day and has not got off the sofa. I took her to a&e yesterday as I saw a bruise and when I did the glass test it didn't go, after a very thorough examination they said she could come home, I am now concerned about the lack of fluids she is taking in, what are the signs to look for in case she get dehydration?