By this time you have been wearing them at night for some time ? How are things so far ?
Some suggestions as to how to allow your g/f to let you wear full time.
Admit to her outright that since you started wearing, A. You dont mind wearing them, and actually find them comfy. Leave the ball in her court, and see if she agrees with you. If she does, then comment back that she looks real cute in them. Then sk her if she finds them comfy as well.
If all those bring good results, ask her one late afternoon (early in the evening) if she would like to get diapered with you, and have some cuddle action.
SLOWLY entise her to wet, only to see what the feeling is like. If she doesnt like it, now you know. If she does, buy her her own pack.
David