If she doesn't mind living in a up and coming Journal Square area in Jersey City, there is a post office there. Its on Kennedy, the neighborhood is changing so quickly and its the best time to buy there.

I live by Saint Peters College and I am new to the biking world. I have a vintage Schwinn however to the naked eye its just an old bike with a basket. So me being totally naive I tied my bike outside, I put the U-lock around the wheel but i tied the cable around the pole. It was a pouring raining and someone still cut the cable however they left the bike. I was totally shocked yet happy by lovely bike was left behind. After that i have been bringing it inside my apartment. My new condo converted building now has a bike room but no bike rack so needless to say I will not be leaving it down there until that happens.

I was more surprised because I have left my bike at Journal Square tied to a bike rack for days.

So my suggestion would be to bring it upstairs due to the bike not being there or someone cutting the tires or what have you.