Fun Party/Mini Games for 5yo and me

These 2 are great:

https://store.steampowered.com/app/238460/BattleBlock_Theater/

https://store.steampowered.com/app/204360/Castle_Crashers/

Also look into the Lego games as they have Co-op/Split screen, there is a sale now on them: https://store.steampowered.com/sale/lego/

Hope that helps.

Pummel Party

My almost 3 year old like toybox turbos
https://store.steampowered.com/app/287260/Toybox_Turbos/

Party Panic is pretty decent. Also has a free roam mode that might be fun for the both of you!
https://store.steampowered.com/app/506500/Party_Panic/

The first games i played with my (then 5 years old) nephew were the Lego games and we had a great time!
I suggest the Harry Potter ones but not the Avengers nor Ninjago because the gameplay was much more difficult.

I 2nd to everyone saying Lego games. I would suggest Lego World but its not available in my country. I dont play minecraft, I grew up with Legos. I will say there are some multiplayer and co-op games you can look into. Tabletop sim has this fun puzzle mod that lets you piece a puzzle together with selected images by you much like a jigidi but it allows up to 4 players so that might be fun imo.
Cheers~

Asides from those mentioned, there's also:
Heave ho
Human fall flat (a little trickier, but she may find it funny)
Octodad Dadliest catch has a co-op mode
Toy story 3
Wuppo
Pikuniku
Yooka Laylee
Uni (very basic mini games, but maybe fun for a bit)

I know a lot of these aren't party games per-se, but they are games I played with my kids, and they had fun.

Although not exactly what you are looking for - Fall Guys is a lot of fun for all ages

Hmmmm 🤔
100% Orange Juice is very Mario Party-esc. I'll admit upfront it's uhh....kind of weird and takes some getting used to. And even though it's a 4-player party game, I'm not certain if it does local multiplayer.

lovers in a dangerous spacetime

Nippon Marathon, a game based on Japanese game shows. I haven't played the PC release, bought it on PS4 for four players since I have plenty of controllers there, but I'll recommend it as a party game. Played a couple of matches with the nephews.
https://store.steampowered.com/app/746940/Nippon_Marathon/

Wizards tourney perhaps? https://store.steampowered.com/app/725110/Wizards_Tourney/
Different mini games. Played it with nephews a few weeks back, and they seemed to like it.

Minecraft...... i play with both my girls 4 and 8. Start on creative mode then go to survival when /if the want to

I have heard Overcooked suggested as being like mario party before but have never played it so I can't say whether that's accurate or if it would be easy enough for a 5yo.

If you are not opposed to emulators/consoles, there are some good options including actual mario party. if looking at wii games on wii/doplhin, i remember one called boom blox that was kind of like a 3d jenga and very thematically appropriate for that age. unfortunately, afaik it was never ported to pc.

edit - added link

This one, believe it or not. It was made for a similarly aged child: https://store.steampowered.com/app/491110/Duckie_Dash/

Toto Tempe Deuxe: https://store.steampowered.com/app/342920/Toto_Temple_Deluxe/

Don't think this would fit your description but the Guacamelee franchise are fun party games.
https://store.steampowered.com/app/275390/Guacamelee_Super_Turbo_Championship_Edition/
https://store.steampowered.com/app/534550/Guacamelee_2/
Both games are split screen. Only complaint from a person I know when he played the games with his daughters was the camera would leave other players behind but otherwise, it was fun for them.

Have you considered buying a Nintendo Switch? It has so amazing games addressed to all ages! :D

P.S. most games people commented are also great choices! Happy gaming with your little daughter!