Sorry, I don't know anything about Shimo other that the fact that it supports several different network protocols including but not limited to OpenVPN. Tunnelblick only supports OpenVPN.
If your wife's company has an OpenVPN server, then you should be able to connect to it using Tunnelblick. You should contact your wife's company's IT department to find out, and to find out how to connect to it (they should supply and OpenVPN "configuration" file and you can just drag/drop that file onto the Tunnelblick icon in the menu bar.)
You could try posting the shimo.s4account file (X out anything like usernames, passwords, certicates, or keys) and we can take a look, but I suspect that it does not use the OpenVPN protocol, so that probably can't be converted.