Adjustable legs are a bit overrated, especially if you don't really care about ergonomics as much (or are just on a tighter budget) but facebook marketplace is your best friend in either of those cases. Sounds like giving the malm to your girlfriend is already the best move no matter what happens, you just should probably upgrade yours in the meantime.
Pretty much anything when it comes to desks are secondary in comparison to being sturdy and looking good, height usually gets changed with an adjustable chair so you shouldn't have to worry about that. If something is nice but not well kept after, maintaining desks that are made of actual wood is still easier and worth more than buying one made of IKEA wood and having to replace parts entirely over time
editing to say that if anything else look into getting a deeper desk, 30 inches was a game changer for me over 23