wareh- I think Karen is right- it was said in the heat of the moment by your mother. As parents, sometimes we all say things we shouldnt at one time or another. Maybe you should sit down and talk to your mother about what she said. Maybe she didnt even realize you heard what she said- explain to her that scared you, and upset you.
One year I got mad trying to get a christmas tree up by myself. I was wrestling with the stupid thing for like 20 minutes, when I muttered to myself- "remind me to get a fake tree next year."" It took me about 20 minutes to realize my daughter had left the room. I thought she went to get some ornament boxes- I found her crying in her room. She thought I was serious, and I felt like an idiot to mutter something like that loud enough for my 5 year old to hear... I apologized to her seriously, and told her I didnt mean it at all and was very sorry. Parents forget that children take their words seriously- I mean sometimes we say things and they dont listen but we have to remember- they do listen when we dont think they would.. Maybe thats what happened here- .. why dont you go talk to her- if you can.. Start out with this " Mom- can I talk to you a minute-..."