Considering she's only 22 according to the synopsis, that would mean she would've been drinking like a fish for two years (assuming she started at the legal age).
Oh yeah that exact cliche happened in that Point Gifter adaptation verbatim. I Never understood the MCs who are not reincarnated individuals having the mindset of a typical JP protagonist. At that point the author might as well just write an isekai then...
That reminds me a few years ago when "Hokkaido Gals Are Super Adorable!" released their first segmented chapter, r/manga was feeling some heavy PTSD because of Gal Cleaning.
What never made sense is how can a reincarnated person who was absolutely average in intelligence somehow figure out how to manufacture guns, and modern devices. Assuming they're not constantly on Wikipedia on the small hope they reincarnate in another world (like isekai tensei soudouki)