Its not a broken cable. If you look carefully at the packaging and features for that drive, you will notice that Samsung tells you it is only supported on Windows. They prepared the drive for Windows, and MacDrive did not fix the partition table that Samsung set up.
But don't worry... all you need is one of these. You might be able to find one at your local OfficeMax for twice as much. Any external enclosure or dock will do I believe.
Pull the SSD, connect using a cable like that, or put in an external enclosure, boot the mac from your Snow Leopard installer, under Utlitiles menu choose Disk Utility, and you will be able to see it, and correctly partition it replacing the MBR with GUID, quit Disk Utility, and you can then complete your System installation.
After the installation is complete and you have rebooted and walked through the Setup Assistant and logged in, shutdown, and only then install the drive internally.
Snow Leopard includes TRIM support for Apple installed SSD's in Snow Leopard 10.6.8, but no one else's SSD's. After you get the System installed, and the SSD installed, update the OS (I recommend you download the 10.6.8 Combo Update rather than using software update — its much faster to download and install the combo than the individual updates), you're going to want to enable TRIM. There are instructions on how to do it manually, but using TRIM Enabler has the exact same effect. There is some more tuning you can do to optimize Snow Leopard for SSD.
Also, do your friend a solid (since you screwed up a little ;). Create for her a Snow Leopard installer for recovery if neccesary, except don't use a crummy unreliable elcheepo USB thumb, use an indestructable SD card. The linked instructions are for a USB thumb, but the instructions for doing this with an SD Card are identical, except that you'll be using an SD Card instead of a USB Thumb. Then purchase this kit for her, and once you indeed have a recovery/installer SD Card made, remove the optical drive and install it in this, and get her a 750GB Momentus (*I wouldn't recommend the 1TB notebook drives... and newegg is out of stock of these 750GB drives, which is a strong indicator that something is up! And wow that's a nice price!). And since you volunteered and you've really jammed her up with this not getting the right SSD thing... may as well max out her RAM. You're really going to feel good about yourself, I can promise you that.