I agree with the 'break' part and disagree with the 'make'..
Just copying my reply to other post with some editing here..
She always claimed to know her chhotey and said she could red his eyes, but frankly she did not even understand what he was going through when he declared he wanted to marry Lavanya... It was only after Khushi kissed him, she thought about bringing them together (even a 5- yr old could have understood that). At least mami realized that before her on Payash's sangeet (she said something like 'ek pe ek free' scheme by Gupta sisters)... Only good thing she did was send Khushi to pool side when Arnav bought the bangles, but even nani helped them in the sari selection incident.. so I did not find anything great in what Anjali did... yes, she did try to show she cares and tried to bring them together in the contract marriage track, but that hardly holds any meaning since she was jealous like anything when Arnav celebrated Khushi's b'day in private in their own room!
About the miscarriage... whether she did it purposely or not, it definitely was not to bring Arnav-Khushi closer, it turns out, it was only to bring Shyam back... Arnav-Khushi came closer over the time, mainl during his kidnap...
'Breaking' - I think she is capable of doing that considering how she cried over the flowers and Khushi's birthday, her bad wishes probably would break them apart... and only then she can again act as a caring, loving sister...