Thinking about starting back into the game. Question on sub accounts.

Hello! Was thinking about playing this game again. Started in Vanilla, and played until MoP. Well I left and came back into MoP, though quickly got bored again. Was thinking about rejoining with my wife. Question is, is there anything I can do to let her share my collection?

We met my senor year, met due to WoW. Anyways, she shared an account with her father. Her father lived in another state due to divorce, but she stay connected and played WoW with him along with her half siblings. They had like 3 sub accounts, she owned one. However, her little brothers would sneak on from time to time, and once she stopped playing her little step-brothers basically destroyed her account. Selling all her transmog gear and just ruining everything she had.

She worked hard and earned a lot of her own mounts/pets. So basically after that she didn't want to play since she had nothing left in the game. So I was wondering if I could make her a sub-account under me and she can use my mounts/pets as I had plenty of the ones she did? I'd hate to have her 100% restart.