Friend won’t stop

My friend and I we both just found out we are pregnant unfortunately I lost my baby . This is my third miscarriage in a row. I am so upset and trying to heal. But my friend won’t leave me alone she acts like I should just be ok. Not only that I raise her daughter and she has 4 other kids now she is pregnant with another one so I am upset anyway that she is pregnant because she won’t even help with her daughter that lives with me.ugh I am so frustrated. How do I tell her to back off and let me heal nicely. I don’t want to be rude but no one lets me heal and vent, seem like not really my friend. But I have to deal with her because her daughter lives with me .....any advice????