I am considering buying my gf a vibrator

Me (19M) and my gf (20F) have been dating for over a year now, it’s both of our relationship and we’re both virgins. We pretty much don’t have a sexual life other than her occasionally being fine with jerking me off. I tried initiating things with her slowly a lot of times, but she always declined me, and she finally told me that the reason is because she hasn’t explored her body yet and isn’t comfortable with it. The problem is that she can’t orgasm by jerking off, and she’s barely never in the mood to do it, so I thought a vibrator could help her out. The only issue is that I’m scared she might become dependent of the vibrator, and she just won’t be able to orgasm just with me, and I don’t think that would be good in the long term. I know the few of her friends that use vibrators can’t have sex without them, and I don’t want that to be our situation if it’s possible. Does anyone has any suggestions if it’s worth it or not? We also quickly talked about it and she didn’t want me to buy it as she thinks I could spend it on other things for her, so I’m not sure if should even I think it could help her