https://pcpartpicker.com/list/gK2jBb

Am not pro at this, what can I do better? What needs replacing? Thanks in advance.

SSD is pretty much a must have. 8GB SSD Cache on that 'hybrid' HDD isn't really that good.
Get faster RAM. Ryzen scales greatly with it. So 3000-3200MHz
Unnecessary large PSU, a 500-550w would be more than sufficient.

What are you going to use this PC for?

Faster and double the RAM.
Faster storage (only half the storage, you can add an blue WD blue 1TB for 44$)
GPU will be able to booster higher.

https://pcpartpicker.com/list/fG2jBb

Still uncertain what you are building towards. But it's a pretty decent all-around PC.

https://pcpartpicker.com/list/nMy8bX

I guess really the only thing she really needs is the OS on the SSD.
I got the 750 bc its the same price as the 550 for now, and thought it wouldn't be too much.

What do you think of this new version of the build?

She is a light gamer, but I'm thinking that's going to change soon.
It won't be used for pretty much anything besides that, and social media, movies, etc.. basic web browsing stuffs.

https://pcpartpicker.com/list/HgJ2WD
CPU is better for gaming.