My friend cant have kids..

So one of my good friend cant have kids.. They been married for 8 years now and she asked me if i can carry her child. I said yes because im trying to help her and i know how bad she wants to be a mother. She told me she wants to do it at home not at a clinic because is expensive, so her husband will give her the semen and she will place it inside of me. Ok thats fine

But i told her shes going to have to pay for everything i need during the pregnancy. Like doctor visits ect.. She got upset and asked me if i could pay half of the doctors visits and she will help me. Im sorry but am i wrong for thinking she is absolutely insane if she thinks i will be taking care of of anything? Im already providing her will carrying her child for 9 months and to make sure i stay healthy ect. I already have a 2 year old and my own bills to take care of. I find it odd that she would expect me to do more than that. Shes basically telling me she cant afford to pay everything. So my reply was why have a child if you will not afford it? She got mad and called me cold hearted, that im putting her down because i can have kids and she cant. I dont think im wrong by what i said. Would you go on with it if you were in my shoes?