This is tangential enough that I'm not even going to consider writing it as an answer, but I have to point out that "How can I make my girlfriend...?" is major alarm-bell phrasing for me. Human beings can't really
make each other do anything (not willingly), and in any sort of healthy relationship neither partner should WANT to anyway. You note that English isn't your (or her) first language, and I'll make allowances for that — maybe you really meant to ask, "What arguments can I make to convince my girlfriend...?" Words matter, and talking about "making your girlfriend" ____ is creepy. —
FeRD 1 min ago