Holding grudges against your friends- Should I?

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So I have this "friend." She VOLUNTEERED to throw me a baby shower. We had this planned about 3 months ago. So I pick a date and everything is good. She said she'll take care of everything and all she needs is a list of guests. So I make the list and give it to her. Well a couple weeks go by and I wanted to check the status of everything, so I ask her. She says that she has been busy but she will get invitations out as soon as possible. Well this same routine goes on for about a month or so and it finally got to the point where I said that if shes too busy to do it then thats fine, me n my boyfriend would take care of it. But she insists on doing it. Well to make a long story short, she ends of sending out my invitations just 2 WEEKS before my baby shower. So I was a little irritated with that but just let it go, instead of stressing on it. Well, a day before the baby shower, she tells me that she forgot she had something to do on the day of the baby shower and cant make it. I was shocked! but she continue to say that she will still get the food for the party so that I would not have to worry about it. Well the day of the party, we go the store where she ordered the food at to find that she had not paid for the food! So she pretty much left me with the bill. I was sooo hurt! so with all that being said, I have not talked to her since then only because we are co-workers and I had been out for a week due to a death in my family. Well, today is my first day back and I will probably see her. Now, part of me wants to just ignore her and make it known that I am extremely upset and feel extremely betrayed by her, but the other half wants to just be the bigger person and just go on as if nothing happened. What should I do? What would you do if you were me!?