Deposit for girlfriend (pension) transfer

Hello everyone, I would like to create a depot for my girlfriend. Unfortunately, she doesn't want to deal with the topic of pensions/provisions yet. That's why I want to set up a portfolio for her without her knowledge with a neo-broker. Do you think there is a way to create a depot and transfer it at some point? At the beginning I would deposit something monthly. And as soon as she is ready, hand it over to her completely. For me it's not about what I should invest in, but now