firstly she should see her GP for advice. If she has an infection they should be able to prescribe some anibiotics for her.
She can take paracetomol and also i think she should be ok to have a vapouriser in the room and vicks vapourub.
As for sickness, the only way to try and beat it is to eat little and often, let her eat what she fancies, within reason, and if she doesnt feel its healthy enough then pregnancy vitamins can be taken too.
She needs to get as much rest as she can, early nights and no overdoing things, pregnancy alone is tiring without being ill on top of that.
i hope she feels better soon, the good news is morning sickness usually subsides at around 12 weeks.