To be fair, Hitty is not really the hubby material for most girls. Most girls look to their would-be spouse as a mature person which Hitty through his various displays shows he is not. Then there is the over powering MIL. It is one thing to try being polite to the woman during the short stint one is there in the house but to make that a lifetime commitment would be too difficult for any normal girl (I am not counting the eternally suffering bahus of our T.V. shows here). Without really bringing out the true reasons why she is reluctant to take the plunge (which by the way would have sounded rude and offensive for the likes of Hitty and his mom), she politely declined their overtures.
I am with Pooja here and hope she finds a good match outside the house.