If she doesn’t need email at all during her trip, maybe she can hide the app button on her phone if that’s how she’d access it. Then there is no temptation every time you open your phone 
I’d say delete the app but that’s such a pain with email, hiding it makes it ‘outta sight outta mind’.
Our family friends, the daughter went on a service trip to Thailand these past 2 weeks with her school during February Break. She barely had time to do much but a quick message or call home. It’s nice to see schools picking them up again slowly around here after so many stayed away because so many got caught in the Covid outbreak lockdowns. We had so many friends here with kids trapped abroad for a bit. Full term and year study abroad programs are in full swing, but the break trips have still been very scarce though picking back up (yeah!). Hopefully your daughter will be too busy to even remember it is M10 