Is this normal.......?

I am a little worried about my mom. She has Bipolar and is acting a little weird right now. First, she is obsessed with the Casey Anthoney trial. She has spent HOURS on this computer looking up photos of the trial or family, then editing them. She is also obsessed with Facebook and talking about the Casey Anthoney trial on facebook. I literally got up at 3pm yesterday and my mom was on this computer without getting up to do other things until 10pm. She was looking at pictures about the Anthoney trial. This has gone on for a few days now, and i am a little worried. She is also saying me and my little brother & sister never ask for snacks or left over things in the kitchen but before she would always tell us ''why would i care?'' Now she says everytime ''idk i, you guys never ask''. Could she be going manic?