make sure she does not travel on friday, sometimes there are delays and people are stranded because of shabbos. she should have a contact in italy just in case ex. chabad
she should not shop or go sight seeing at airport, but go directly to her next flight. sometimes due to delays there is not a lot of time between flights. Ask only the airline staff on the plane what to do to get to her flight and which terminal it is in. She should not ask non staff personnel since they dont understand english well or will give the wrong information
just ask that her luggage to checked through all the way to israel and make sure she gets her luggage tickets and put it in a safe place
check online or by phone the luggage number allowed and weight and size for both checked in and carry on luggage, over weight luggage can be a big expense
also make sure she has kosher food ordered and then confirm it at least 36 hours before. i advise she takes some sandwitches and fruit etc. just in case they did not provide or that there is a delay in connecting flights
best if someone is meeting her at the israel airport. if not Nesher shared taxi right outside the terminal door is the best way to jerusalem. she should have israel currency if possible or us currency- one 10 bill and a 5 bill and 5 singles. she should ask the dispatcher what the cost is and not to pay extra for 2 pieces of luggage and carry on
you might want to order a cell phone online to be picked up at the arrival terminal
make she she knows NOT TO HITCH RIDES EVEN FROM JEWS AND STAY AWAY FROM ARAB AREAS.
not all restuarants are kosher or meet your standard. you should be able to print out the symbols online