Hi @organiccupcake - do you know if your daughter actually clicked on the "x" and deleted your games, or did they just "disappear"? If she accidentally deleted by X-ing them out, then unfortunately the games are all gone.
If she didn't directly delete them from inside the game, then it's possible they're saved under a different Windows user name or the game redirected saves to OneDrive (or you were using OneDrive and she used the computer's hard drive). Here's a couple of ways to find your missing games: https://sims4.crinrict.com/eng/2014/09/save-games-disappearing/ and an explanation of the game files - try the part under "In the File System": https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/
I hope you can find your old game files. I had a similar problem once, although no child to blame for it ☹️ - and lost my entire legacy challenge game. I now regularly copy my saves folder to another spot so if it ever happens again, I'll have a backup. It's a good practice to get into, even if you find your files.
🤞 Hope you find your save files. Happy Simming!