if she didnt get the child yet, i think she must wait for the delivery and handle the situation with patience, some times a child strengthen the bonds between parents,

she must ignore everything for sometime more , behave normal, so that it dont effect her life and her babys

she must be under real stress, ask her to have patience..
and trust in Allah ,

she should consult some one wise on this issue, check out
www.islam-qa.com

he may provide some solution in the light of islam, as she is a muslim..

the husband must fear Allah