I have been friends with Jodie for several years and we have lived together for a while now and 2 years ago, Jo had her daughter (Susie). We get along and don't have any problems.
I have helped Jo with Susie a lot in different ways (distracting, playing, supporting with appointments etc). Susie's dad is not around and Jodie's family only help out occasionally, but because they have their own children, jobs, health etc they are not around as much.
Jo struggles a lot with Susie and can't handle temper tantrums, so I didn't mind helping Jo. However, as time went on, it became more helping out.
I am currently 5 and a half months pregnant and yesterday Jo said to me that she wants another baby and plans on getting pregnant soon (she didn't go into specifics about how she plans on doing it) because Susie should have a sibling. The thing is Susie is a jealous child and already I can see some jealousy problems from when my child is born.
If she did have another child, I won't be helping out because I will be focusing on my own child first and I won't have the time, energy for my child, Susie, Jo and another baby.
Although she hasn't said anything, but I wonder if she's hoping because I will be going on maternity in a few weeks that I will be around more and can support her with Susie and her pregnancy.
Would it be unreasonable to tell her that I won't support her if she has another baby?
Unfortunately, in this area I would struggle to find a suitable house/flat and would not be in a good place financially if I moved out, so that's not an option. I also don't have any close family and other friends don't have the space.