The 322 is only a standard def, dual-tuner, and can only output through coax, composite or s-video.
When they install it, it's standard to hook it up to the main TV (where the tuner's located) through an A/V connection, and then they just run coax out from the 2nd tuner to the TV in another room.
It's possible that they disconnected the cable wires from the outlet in order to run the satellite cables there. That's what they did to me (I also have the 322 and SD-only from Dish), but I didn't mind because I was cancelling the cable anyway, and I get my local HD over the air.
But if your mom cancelled the cable service, you're SOL for the local HD, unless you either upgrade your receiver, and package (and possibly the dish, too), or use an indoor or outdoor antenna. Or you could just order the limited basic locals from cable again (usually $12.-$15.), like was mentioned above. Hopefully, Dish didn't just splice into your cable line somewhere outside the house so the cable company (or yourself) won't have to run a whole, new separate line again.
Since they just put it in, you could possibly get them to swap the equipment out, if you tell them you'll be cancelling otherwise. (If you do have them come back out, I'd make sure they run separate lines and re-attach the cable.)
But even with something like the 222 dual-tuner, although you'll get HD to the main set, you'll still only get SD to the second one. You'd have to rent two, 211 single-HD tuners to get HD at both sets.