I think we give kuhu very less credit when it comes to her capabilities & EQ levels, maybe the writing doesnt seem to do justice or her dialogues dont give enough clarity to understand her perspective
for me Kuhu is a very deep(for lack of better suited word) character, might not be layered as Kunal because she is an extrovert
but Kuhu is very much capable of understanding human emotions, infact more than even abir, I actually find her the most intelligent out of the 4 in this department, thats why she is able to forge bonds easily with even random people
her kuhuness which they try to limit to her awesomeness as an event decorater & her fashion-sense or her social media love is totally undermined, her kuhuness is actually much more than these, its about her being able to accept everyone with their flaws & still love, support & care for them without judging them(all credit goes to her bond with Varsha, because thats what she has learnt from her, by forgiving shaurya, accepting Kuhu, loving Kuhu, fighting for Kuhu's rights, still trying to balance the peace & conflict in the maheshwari family)
so even in Kunal's case she is able to see beyond what all is going on, thats why in recent episode she told 'mujhe tumhari chinta hoti hai kunal', she can sense his turmoil & his pain far better than anyone else, infact she understands his feelings even when he himself is not ready to accept or acknowledge them, like his love for her, and I really love & admire kuhu for this very fact, its her biggest strength & gives a lot of depth to her character which on the surface feels very shallow, because for her the actual, genuine feelings matter, not their acceptance, declaration, display or acknowledgement
she was able to forgive kunal for that fake wedding because she could understand that kunal did it to save abir from mishti, ofcourse it was easy for her to relate to kunal because she herself has been a victim of mishti's many impulsive acts in the name of her trying to help