Sister Amna, ask the sisters in your local masjid. It's easy to find abayas that are extremely cheap {though they tend to look drab}. Also sis beware of giving out your address to complete strangers especially men....you don't know what their motivations are.
they cud be sent to a masjid instead of her house
I've worked as a Daa'ii for a prominent Islamic website for several years, and we constantly sent out thousands of free literature to New Muslims, My motivation for offering her an Abaya is the reward of Allah, that's why I want to pay for it myself, similar to the saying of Allah. I also know some people in her city (I think she said she lives in Chicago), who may be able to give her an Abaya, I also know of a female shop owner in NJ who sells Islamic clothing that may be able to help, while in general she should be careful, there are brothers on this website who have been here for a long time that people know wouldn't have ulterior motives. Or you can do us all a favor and give her one of yours.
MashAllah. that is really good. May Allah (swt) reward you for that. Just an advice (it is off-topic sorry). Please avoid visiting forums which belong to deviant sects (you know what I mean). JazakAllah Khair.