English File and
Cutting Edge might be possibilities, though possibly more British orientated. You haven't said where you are and I'm less familiar with American style texts (
Interchange ?). You'd have to check books are at the right language level (elementary?).
I suggest visiting your nearest specialist ESL book shop as well and see what's on offer (or a book shop that sells ESL books). It's likely they'll have more up to date material. Of course you'd then have to buy the book anyway if the library doesn't have a copy but sometimes libraries will order books. Anyway, if you can afford it doesn't hurt to have one or two supplementary books for ideas/ activities/ pair work /grammar, etc. on top of a basic course book. The course book should give you enough material for 20 weeks, though. How fast you go depends on the level of the students, what they can handle and what the overall goals of the class are (eg., an exam class with a strict limit - not a worry here, I'd imagine).
There are also a lot of materials available online and you might like to do some preliminary 'get back in touch' activities with the group. You've met some of the women so you'll have an idea of what they can handle and if the material will be too hard for them. You could always leave out or simplify questions:
http://esldiscussions.com/
http://iteslj.org/questions/
I also suggest starting off with some basic revision from Entry Level 1. I'm assuming you didn't teach that course, so can you find out what they covered? (If no one can help, the women themselves should have previous course notes). Good luck.
