Aashka was wary of Urvashi's dominating nature in the first two weeks and wanted to be out of kitchen team. Their dislike grew with time and they started cribbing about her most of the time. If Del's words are to be believed ( I believe it because Del told it in front of Urva on Friday episode) she did give hints to Urva about changing behavior.
Still, we didn't see Urva bitching about Aashu or Delu with anyone.
Urva got that Aashu Delu had problems with her and at that time the Milltary task happened and all hell broke loose.
Urva's comment in anger that some women can only speak behind and not in front while fighting with Sapna did not go well with any of the gang members. They later tried to prove their point to Sidhu again and again. Somehow, Aashka got delusional and she firmly believed that Urva bitches about them behind back while the truth is Urva hardly spoke about them behind their back.
In fact, Urva was fond of Delu even when she had a tiff with Aashu
Problem with Aashka and Del is that they are constantly bitching and cribbing about what Urva and others did. They don't like Urva - fine. But constantly making negative comments just show their negativity.
Aashu didn't even confront Urva ever for her dominating nature. And Del had been always very busy to be in good books of everyone.
On the other hand, Urva had not been such a bitching queen like AashuDel and more straightforward in her actions. She had openly said she is here to play a game and is playing it openly. She knew when to make alliances and she is sticking to her allies thick and thin
That's the difference b/w Aashu and Del. Though the two have too much negativity within them, they have the delusion that they are perfect while other hand Urva had hardly behaved in that holier than thou attitude.
That's why Urva has so much fan following.