HELP! Shower for a 3rd baby Is it appropriate?

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I am pregnant with my 3rd child. I have a 9 year old and a 5 year old. This baby was a complete and unexpected surprise. My husband and I were not planning on any more children. My mom threw me a baby shower for my 1st child almost 10 years ago. I did not have a shower for my 2nd because we still had many things leftover even though there is 5 years between them. We kept everything between baby 1 and 2 because we knew that we were going to have a second child.
About a year ago we gave EVERYTHING away. I mean evvvverything. My Mom now wants to have a shower for me.
Is it appropriate?? Do people do this?? She wants to invite all of my friends a large shower. She thinks it's fine and I'm torn.

Help!!!!