What's so difficult? My daughter spilled a drink in her Mac laptop. I had her send it to me, isolated the problem quickly and swapped in a new keyboard for $100. Instructional videos are everywhere on the Internet, as are parts. A neighbor had a problem with his, and I swapped out his power inlet jack for $20 (he had broken the tip off the power plug and fried the jack, this was pre-magnetic plugs). I've even swapped out laptop screens and backlight tubes. Easy.
Replacing a keyboard is easy? I’ve been misled then with everything I’ve read. I did basically the same thing as your daughter...a few errant drops and fried a row of keys.
Do you remember where you got the new keyboard?