With summer and 40C plus temperatures approaching, the situation in refugee camps such as Zaatari - which is designed to cope with just 60,000 people - is critical, with relief agencies hugely over-stretched and disease looming.
Eight thousand refugees flee Syria each day, with 1.6 million having left since the start of the bloody conflict, which is rapidly escalating with reports of atrocities by both sides and allegations that chemical weapons have been used by President Bashar al-Assad's forces.
Ms Hamilton - speaking on the phone from Jerusalem - said documenting these people's experiences was crucial, but also brought some nerves. "About what you are going to see, what you are going to hear ... it's so hard to imagine being in their shoes, and what they've actually had to leave behind. These are families that just had normal, ordinary lives, they were getting on with their businesses, their kids were in school, and for a lot of these families that has been completely destroyed."
Ms Hamilton will be in Jordan for a few days before returning to Jerusalem, and will make a number of repeat visits.
To help, donate to Oxfam's emergency response at www.oxfam.org.nz or call 0800 400 666