What a lovely friend you are! I agree with everyone elses ideas. Maybe a magazine subscription? Or what a about a "pamper pack" with choccies, a little bottle of champagne, a magazine or book, scented candle, some little food treats etc depending on what she likes.
The main thing is she will probably be feeling very down about herself so anything that cheers her up or boosts her self esteem is great. I think knowing she has such caring friends will help a lot too.