PLEASE HELP!!

Please help me understand how I can be here for my sister. She has 3 children and is 5 weeks pregnant right now and wants to get an abortion not she wants SHE IS. I don't know how to be there for her I can't support her decision. It is too hard for me. I've been TTC for over a year now having problem after problem why I can't conceive even one child and  I can't wrap my mind around why she's just throwing it away like its nothing.