If buying a full wetsuit, in the first instance women should look for the same things as men do. Firstly the stretchy neoprene quality should be warm, lightweight and flexible. When buying a full wetsuit, the stitching should be sewn using the technique of blind stitching. This means the needle does not fully penetrate the suit so there are no holes where water can get through. This is not so important when buying a summer wetsuit or a shorty wetsuit.
Look too for sealed seams that are liquid sealed and liquid taped. This means liquid rubber is used to seal the seams making them waterproof and warm. Check also, if warmth is required, that the suit is thermally lined.
The difference between men's and women's wetsuits is basically the shape. Ladies swimming wetsuits are wider on the thighs and hips and have a different cut over the chest and shoulders. Ideally swimming wetsuits for women should be tried on before purchase as they do need to be a perfect fit when in the water. Some women choose to wear men's small wetsuits as they may be a good fit for them.
In recent years prints and colours have been introduced for women's wetsuits which are becoming more feminine. It is up to you whether you go for this option or prefer the traditional black. Whatever is chosen, go for the best you can afford as a wetsuit is a long term purchase.