How do I tell my mom I’m moving in 87 days?

My mom and I live together. I’m 23, and we both work full time even though I pay majority of bills when it’s suppose to be split even. I’m moving to another state to be with my fiancé, which she knows but she doesn’t know exactly when I’m leaving. I need help with trying to tell her when I am. We are behind on rent but only because she doesn’t put much $ into bills like I do.

I know she’s going to feel some way since our lease is up in May and I plan to leave in March. I do plan on paying half of the rent for March but leaving a little extra $ for April rent since she won’t have anymore help. I just need to know how to go about telling her I’m leaving in March

How do I tell my mom I’m moving in 87 days?
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