If my daughter wears a large in shirts she's tall and 6 years old. What size should i get? Thank you

Either the Medium or Large if you would rather they not be tight. They do have a lot of stretch so hopefully either size would work. There is a size chart on the side picture so you can measure her and be more specific. Let us know if you need any further help.

Is this lined or doubled in the front?

This is not lined but is a nice soft cotton and very comfortable.

Do they ride up? I’m looking for something that doesn’t end up under her armpits. Does anyone have suggestions?

I bought these for my daughter and I asked her and she said that they did not ride up.

Does this bra have removable pads

The fabric is double lined but there are not removable pads. You can always put your own pads if that is what you are looking for. Let us know if you need any further help.