I would first ask the question of if she really wants one. Dont want to sound like a party pooper, but if she isnt into the technical side of things (setting up aperture, shutter speed, ISO, etc) or at least learning about it, then a DSLR could really put her of photography. If shes a point and shoot kind of gal (as my missus is) then the Canon S90 or G11 could be a good way to go. No lenses to change, but you have quite a lot of power over other settings such as ISO, aperture, and shutter speed, so can get most of what you can get with a DSLR but without the hassle if required. What should be noted is that on Auto, a DSLR will take worse shots in most cases than the P&S cameras. This is because a lot of work goes into Auto mode for P&S whereas for DSLR they assume you wont use it. I have seen many times people become disheartened at Auto mode in DSLRs, hence the warning.
Saying that, if she does like the challenge, you cant go wrong with the current crop of Canon or Nikon SLRs, just watch out for that lense lust, its a slippy slope!
Should also be noted that the G1 you are looking at is a Micro Four-Thirds camera, not strictly an SLR, but a new standard. Might be an idea to read up on it a bit so you know what you are getting yourself into