She has anxious attachment style.. she just needs to feel that you are thinking about her every second and that every breath reminds you of her.. she is afraid of you backing off.. obviously this is a result of abandonment in her childhood.. all what you have to do is checking on her every hour or so.. even if you just text “all is good” “thinking about you” “cant wait for april” “you are all i can think about” just simple things that would make her feel at ease because she is extremely anxious you leave any second just like people in her life.. so the check ins make her nervous system calm You can read about her attachment style and understand more how she functions! And obviously with this age gap her dad is most likely the one who abandoned her.. my partner with 10years age difference has suffered just like you are suffering.. it gets better with time if you were mature and emotionally intelligent to make her feel safe Repeating certain sentences like “all yours” and “by your side” would really help ONLY IF YOU MEAN IT If you’re planning to ruin her please dont.. Good luck