think your girlfriend is a quiet girl, so on April Fool's Day, it's best not to be too outrageous when you give her a gift. Just give her something slightly stimulating, otherwise she won't be able to bear it and it will backfire.
There is a very popular gift on the Internet now, specifically for weak girls, that is the eye-popping doll. It is actually a decompression gift. If you pinch it with your hand, the eyes will pop out, like the eye-popping Gray Wolf, and the eyeballs will turn around. It's fun. Most girls will be happy if they pinch it. This can at least make people forget their troubles temporarily, which I think is good.
As for the scary or vicious ones, don't give them. I think your girlfriend's personality should not be able to bear it. She is too quiet, so you should stop at the right time. The above is my suggestion, I hope it helps you.