No, she has no right to decide for her child on her own. Especially after watching the scene between anurag and sneha, nothing can be more cruel than prerna depriving her own child of his/her biological father. .
I hope they show a track where anurag makes a deal to get his child in return for getting away from prejaj's life foreve and ever.
The same biological father who did not have this thought that the woman could be pregnant even once after all that happened in that hut which was pure love like he said and even I believe it was love but he didn't even bother thinking about what would follow the deed leave aside asking her about the same?
Let's imagine, Komolika wasn't as evil as she was, and the things that she did to get him weren't a facade - he wouldn't have left Komolika and would have wanted Prerna to move on like he said before the engagement. What would have happened to the child then?
Though I truly believe, both are wrong in their own ways but as far as this bit is concered, I don't have much sympathy for Anurag.