I disagree. It's not the host's responsibility to cover for another person's life. Every single one of those excuses listed above says that the late mother's reasons for being late are more important that the mother who took time out of her life to plan a party and see it through.
Sorry, but if this party was as important to Mary as everyone seems to think it is, then Mary should have known to stay on top of things and make sure her mother knew something special was coming up. Yes, even at 8 children can be taught about taking responsibility and making sure you do your part.
Consider this a learning experience. If OP caves, then what Mary learns is that you can do anything as long as you have a good excuse. If OP holds the line, then Mary learns that life isn't always fair and she needs to pay attention to deadlines for issues that are important to her.
Sorry...that's ridiculous. if OP decides to have a heart, Mary learns that there are still some kind people in this world willing to extend a little GRACE.
Blows my mind...all this over a 6 year olds birthday party. Good grief!
OP, you should not have invited someone else so far in advance without having the kindness to take a moment of your time to double check. It's just a nice thing to do. As the host, it's just part of planning a party. Wouldn't occur to me to be an inconvenience.
I agree with a pp that doing that is far tackier than not rsvp'ing on time.
Oh, and as for me..the goodie bag thing wouldn't be an issue because we clearly have different personalities..I'd be putting them together at midnight the night before the party..


Don't ya'll usually have a few extra goodie bags in case something comes up? Maybe one of the kids has a sick little brother or sister..or something..and you give them one to bring home? I always have 4 or 5 extras! (and I'm NOT organized!!)