Zara,
The ALT's are high, but the drug is not stopped unless the ALT levels are 5 times normal. But, you do want to lower the levels from where they are currently.
The first thing is to make sure the child is always well hydrated, and especially during the blood test, so you get an accurate reading. Exjade/Asunra does require much water, so make sure the fluid intake is good.
Keep the dose split in half and take twice daily. The tabs can be crushed and mixed with any foods. There is an herb called milk thistle, which is a very mild herb and will help keep the ALT levels lower. Find this herb and give it to the child daily. It can easily be found sold online by vitamin companies.
Next time the child is to be tested, have it done early in the day and make sure the child is well hydrated. This should give you a lower test result. If the test is still high, you should consider stopping the drug for a week and then restarting at half a dose for at least one week before going back to the normal dose.