Can you help me with this friendly neighbor/etiquette issue I have with my upstairs neighbor concerning garbage removal?

We live in a 100+ year old home divided into two apartments. The lower unit (mine) has two bedrooms. We are allotted one large garbage can and one large recycling can. The upper unit has three bedroom and is allotted two garbage cans and two recycling cans.

My upstairs neighbor moved in two weeks before my family did. I don’t think she was told she is responsible for taking her cans to the curb on garbage day. They are always full and sometimes my family needs to use hers so I’ve been taking them all out to the curb on garbage day.

We don’t always need her cans but I’ve been a good neighbor and have been taking care of all of the garbage.

Winter is approaching and we live in Wisconsin. It can be brutal. I can only take one can at a time because they are so large. I’d like to not be responsible for upstairs neighbor’s garbage when the weather gets bad.

Any suggestions on how I can approach my neighbor or the landlord?