This is indeed a Catch 2 situation for Ashu...on the one side, there is a woman whom he loves beyond life and who means more than anybody else in this world to him...
On the other side is a woman who has stood by him through every crisis and refused to leave him even after he rejected her love...and there are visible signs of insanity...
However, after taking into consideration everything that has gone on and knowing that my wife is not a lunatic, it would be very difficult for me to dismiss her concerns outright...I have married her for life...to stand by her through thick and thin...I can see that Mallka visibly distresses her...I would sit her down and try to understand her concerns and why she is saying what she is...I would try to reason with her based on Mallika's actions and the doctor's report...I know that my wife has actually been actively responsible in finding Mallika for me and also in keeping her with us even when I chose to let her be taken away to an asylum...so there must be a strong reason why she is saying what she is...while I might not accept her every word as gospel, I would certainly not dismiss them outright without applying my mind to it...!