I hope for the love of God that this is just a tiny, isolated segment of the game similar to the giant baby in Village, and that the rest of the game plays out more normal.
Almost certainly going to be the case.
Firstly, Capcom is aware enough to know players would react like this if it were the case throughout the game. Think Ethan waking up at the Baker dinner table, or as you pointed out, the Baby sequence: rewarding the player with a weapon after that is cathartic and influences the desire to continue playing once armed at last.
Secondly, it would be unrealistic for an FBI agent, even one who is just an analyst or whatever it is Grace does, to not have some kind of formal combat training, especially in a world that’s spent the last three decades dealing with bioterrorism, and a character whose mother was literally there at the beginning of that era.
And thirdly, the vengeance factor from Grace regarding Alyssa is almost certainly going to come into play. There’s no way she’s going to remain a helpless damsel who has to run from BOWs at every turn; she’s gonna get sick of it quick, strap up and start blazing away, most likely right after this sequence reaches its end.
On top of that, Resident Evil has done a better job than most game series of putting women on relatively even footing with men when it comes to moderately realistic combat prowess. Even Ashley, the most helpless adult female main character the series has presented, in the original version of 4 still took active part in her own rescue at key points, and they made it a point to increase that in the remake. No way they’re gonna leave Grace to only be able to run and hide at this stage in the series, regardless of the emphasis on horror.