Babysitting Horror

I was staying with my mom for a few weeks in Canada, along with a couple cousins, aunts, and just friends. Well one night they told me they wanted to get a little break from the chaos and all so they asked me if I'd babysit the kids for an hour or two. I accepted and they left. I put cartoons on for the kids to watch while I cooked dinner. I was in the kitchen, (in the basement with the kids) when I heard the garage door open up. It hadn't even been an hour yet so I figured that maybe they'd forgotten their wallet or something like that. But I had to check anyways, so I walked out and called out for them and I didn't hear anything so I went out and checked the garage. The car was still gone and it wasn't opened or anything, so I figured it was just probably the next door neighbors or just the television show the kids were watching.

We ate dinner in the family room basement and were still watching TV when suddenly there was super bad static and the TV turned off, along with the overhead lights, the only lights that we on were the lights upstairs. The kids and I were pretty freaked out by this so I told them it was just probably out of electricity. We went upstairs, and I felt a draft, I looked at the garage door and it was wide open along with the garage door itself. So I of course thought it was someone in the house. I went and checked all of the bed-rooms. Nothing. Suddenly the power went on again, along with the T.V. I thought it was really weird how those could have gone out if they hadn't died or run out of electricity or anything and have all the rest of the houselights still on. I was sitting down, kind of uneasy, I was just watching the stair rail making sure nothing happened, and then I saw a figure run by so fast I only caught a glance of it. At that I called my mom and told her. I knew someone was there and I'd see someone. I got the phone and dialed 911 just in case I'd need to. When I got to the top of the stairs I heard the kids scream that the lights were off again. I was really worried but had to check and make sure everything was ok upstairs. It went black up there too. But with the one light downstairs still on I could see a shadow of someone. The lights went back on a second after I saw it and the figure was gone. I walked down the stairs halfway and when I got there, someone was sitting there. It was an old woman. For those of you who have read my other stories know that I've encountered this many times now. She did have white hair, she was in a nightdress. She was shaking. I was so scared and didn't want the kids to startle her cause she already seemed scared so I leaned forward and at the same time she jumped up and screamed "Please leave me alone!" The kids heard too and I backed away and she ran out, down the hallway and was gone.

I'm concerned about her and would like to try to help but I'm worried it'll only make things much worse.