Some pregnant women do get perscribed it, but my GP did make a fuss over it being very last resort.
A lot of morning sickness originates from low blood sugar levels as well as hormone levels. If she's not keeping much down, try innocent smoothies for vitamins and calcium (lots of calcium in oranges) ice lollies, ginger biscuits (we eat ginger when airsick from flying) and peppermint tea. Try to give her something before she gets out of bed in the morning as this is when our blood sugar is lowest and we'll feel the worst. (hence the term 'morning sickness)
Also, if you're worried about her getting the right vitamins and minerals, Boots stock something called 'Pregnacare'. It's folic acid plus everything a woman needs vitamin wise.
Don't do what I did the other day and drink lots of water when having a dodgy stomach. It doesn't stay down long
