Kunal knows about Mishti, Mauli fears that kunal will take Mishti from her and he will tell Mishti the truth about being her father, Mauli called the lawyer to understand Mishti's legal situation (She didn't ask Ishaan's permission), she came to know that if Kunal wants he can totally file the case for Mishti's custody. When she got to know that Mishti is missing her first thought was kunal has taken a lot from her and now that he is back he will take Mishti from her, she went to his office and told him that he can't take Mishti from her, Kunal calmed her down and told her that he has no intention of taking Mishti from her...
That was the first instance when she got to know that kunal won't take Mishti, she still didn't believe him and spoke to Ishaan about custody, next thing Ishaan decides that he will take Mishti's custody... OK.. I do not understand how people are blaming Mauli here and not reacting to Ishaan taking Mishti's custody without Mauli's permission, he didn't tell her about it, Mishti is Mauli's daughter, Ishaan loves Mishti, no doubt about that but I don't really think it's safe for any mother and her child to give away custody of her daughter to someone she isn't married yet, he can easily take her custody after marriage and honestly, it's NOT his decision to make, it's Mauli's decision...
Next thing, Kunal called Mauli when she was in lawyer's office..
Kunal told Mauli that he suspects Mishti overheard them, Mauli tells him that it's not possible Mishti will never come to know about Kunal, Kunal tells her that he won't tell Mishti because he can't see Mishti going through the same pain he is going through right now
Does Mauli trusts Kunal? No
She is just assured that kunal understands that it will be difficult for Mishti to understand her situation and he won't hurt his daughter by inflicting his presence upon her.. There's that, there's no trust in Kunal, Mauli is not even happy with the thought of Kunal speaking with Mishti because in garden when Kunal asked her permission to speak with Mishti, she refused straight away, she is just assured that she doesn't have to file for custody anymore, because kunal won't tell Mishti...