trying to decide what to do with my spare bedroom.

I have a three bedroom house here in Puerto Rico. One is a guest room for when family or friends come on vacation here. The other bedroom is an home office/bedroom. You could also use it as an exercise room or a library/reading room. You don't say how old your daughter is but it could also be used as a place for her to do homework or study for school.

maybe you could turn it into a creative room, like if you do art or something. if not, maybe you could turn it into an office and run your business from there.

Hello my dear, First of all, some extra details about how many rooms and what they are used for at current would be helpful in suggesting stuff. Until then you could study the hobbies of all house members and analyze if a common hobby room to host the required stuff for them would make sense. You could rent the room if you transform it into a bedroom and live in a fairly safe neighborhood - that would bring a little extra monthly as well.

You could use it as a gym and equip it with all that is necessary. You could use it for meditation and yoga.

Maybe you can use it as an office with a pull-out couch to make it into sleeping bed in case you guys got company. Or a library or a mini-family room.

Do you have a home office there? Id make it into a small office to work from.

Sewing room? Hobby room? Exercise room?

I use my spare bedroom as an office; actually I have never used it as a bedroom since I moved into this house. As it is currently there is not room in it for a bed. If your daughter has outgrown toys, she probably is using a computer. So it could be an office and computer room for the family. This might also make it easier to make sure she is being safe when, or if, she goes online and visits sites like Facebook, etc.