I loved the Isis, and can't believe I'm saying this, but I think the Medela Harmony is better. It is as comfortable and effective as the Isis, but it is a bit easier to clean and uses standard Medela parts so if she ends up with a manual and an electric, many of the parts are interchangeable if they are both Medela pumps. The best thing about the Harmony is that if her nipples are too large or become too large after repeated pumping, she can get larger breastshields to fit the Harmony. I had to retire my Isis because it was too small.
As for electric pumps, I've heard great things about the Medela Pump in Style (PIS) and the Ameda Purely Yours. My second son was an inefficient nurser, and I needed the hospital grade pump. After renting the Medela Lactina for several months, I bought one on ebay. Although a used Lactina is about twice as expensive as a PIS or 25% more expensive than a PIS advanced, the PIS is a single user pump and the Lactina is a multi user pump. Many people do resell and buy single user pumps, but it's not recommended. You can resell the Lactina for close to what you paid for it without worrying about disease transmission. The only caveat is that if you bid on a used Lactina, you should get the serial number from the seller and check with Medela customer service to make sure the pump is not stolen. There are lots of stolen pumps for sale on ebay.
Ps. I am about to sell my Lactina, PM me if your friend is interested.