I solo balinda all the time with 5 shamans. No healing even required (that 5th grounding totem helps a LOT - also take down the ele when she summons it otherwise the groundings get eaten up too fast).

I try to defend a lot but run into a couple problems. #1 - the horde towers are a bitch and a half to get up into compared to alliance towers, so taking them back is a serious PITA - taking back FWGY is easy though. #2 - lately there have been a lot of horde on D and not enough on O so I have been taking down balinda if no one else is, or moving on to SHGY/IWB to take that right away as well. Once we get to SP I usually go back on D as I'm much less effective across the bridge if my guys start to get picked off one by one.