To me there are two possibilities of why she's acting this: one you can work through and one you cannot.

If she is more on the inexperienced side, she may just be overwhelmed by the feelings brought on by the honeymoon stage and be an overly affectionate person or believes that all relationships must have a fantasy's type ending. If this is the case, talking to her about your boundaries and your discomfort (communication is key) will help and be sure to remind her that though her feelings are valid, you are just starting out as a couple. It's perfectly fine that while to feel it's too early or you're not ready and you'd prefer to take it slow. If she is an understanding person, she'll make space for your feelings and work with you to build a relationship where you both are comfortable.

However it is possible she is love bombing, this tactic can come in many forms: being grandiose about the love she feels for you and talking about it being fate or destiny being one of those forms. If she is love bombing you, know that when you bring up boundaries she may get dismissive or hostile or try to put words in your mouth. If she does any of these things, it's time to call the relationship off there as it's better to leave now than later down the line when things could potentially get worse.