I didn't know my great aunt very well at all, in fact I'm pretty sure I only met her twice in my life. My mother (who I usually stay with since I'm a grad student until May) lives in Ohio, I'm currently in southern New Jersey, and my great aunt's funeral is on Saturday afternoon in New Hampshire. My birthday is this Friday, and I was going to leave for Ohio on Saturday morning since my bf has drill (AirForce) this weekend and will be very busy. However, since my mother is scatterbrained and unintentionally imposing, she decided to tell ALL of my extended family up in New England that she was trying to persuade me to go in their place because I was "driving home Friday" otherwise. My aunt took that to mean that I'm definitely showing up, and gushed about how GREAT it was that I could go. I fucking hate funerals. I didn't know my great aunt. I don't have funeral-appropriate attire with me since I'm on vacation. The drive is over 6 hours from here and I'd need to find a place to stay overnight since the drive from NH back to OH is much longer than I'd have from NJ to OH.

My mom and I have a Skype date for this evening once she's back home, and I have no idea how to convince her that using me this way is pretty goddamn rude. I know that family is still family, but I don't want to go, and she's making me "the bad guy."

TL;DR - My mom volunteered me (to my entire extended family) to go to a funeral for a relative I didn't know. We have a Skype date set up for tonight and I need to impress on her that what she did was wrong and she has no right to use me like this.

Any advice?

[UPDATE] - Thankfully my mom realized how uncomfortable she made me on her own, we talked things out, and she apologized. My aunt also said she understood, and wouldn't want to make that drive either! Thanks everyone!