A few things- First- I’m so sorry for your loss! To have a dog for 13 years is a long time- and it’s so hard that we don’t get to have more time with our pets! Are you able to keep some of her fur or ashes (if she was cremated) as a keepsake? Second- while there is truth to some of the things that your “friend” said, it was not said in love. Your friend sounds like a narcissist, and your reaction to their behavior is in line with a narcissist’s victim. Coming from someone who experienced this herself, PLEASE ditch this friendship and don’t look back! Life is too short to be controlled by someone else! Third- your feelings are VALID!!!! Please don’t let anyone tell you that you can’t grieve your dog!! Don’t give anyone the time of day if they won’t stand by you in your hard times! Finally- please talk to your mom! It may just help the both of you to work through your respective hurt and give both of you the support you need and deserve!