Welcome!
I added in the pic for you. Your attached file uploaded okay but there is just an additional step you had missed. Next to the file name there is an “Insert Img” icon. Once you’ve clicked on that, the photo will appear in your post. (It appears wherever the cursor is positioned).
You are correct that Cottontails (American cottontails) cannot breed with Domestics. In other areas of the world, some of the wild rabbits can interbreed with domestic pet rabbits though. They are the same species.
Sometimes there is also confusion due to the common wild colouring (agouti). This colour/coat pattern is common in domestic breeds. So many rabbits will have the “wild” or cottontail colouring but they’re not wild.
The mumma is pretty! I couldn’t really tell you what breed she is other then part lionhead! It’s possible for lionhead not to have any mane, even full breed lionheads.
I can tell you she is what is called a “pointed” rabbit, due to the areas where she had colour. The ears, nose, tail, feet, though she doesn’t have the typical coloured feet. She looks very sweet.
How old is the baby rabbit? It’s possible if it’s young, they are living companionably together, but do be aware that can change once the baby reached puberty.