In older versions of Vaalmeeki Raamaayan there are a few more verses that contain a situation where Jataayu comes to Raam, after their return from the River Godavaree, to take leave of Him to go and see his relatives and bird-friends. Then Shoorpankhaa knowing that Jataayu was not there, enters the hut area of Raam with a guise of a winsome beauty. [Tulasee's Maanas does mention that she changed her guise into a beautiful woman before coming to Raam's hut]. 

In fact no Raakshas or Raakshasee could approach that hut of Raam, as long as Jataayu was around. And as he went away to see his relatives and friends, and Shoorpankhaa knew that he was not there, only then she could enter the hut area. It seems logical. But in the present version she is depicted without any guise change.

The beauty aspect of Shoorpankhaa is not narrated in these verses by Vaalmeeki Jee. But Raam is addressing her as a beautiful woman. In this case, it looks like as if either it is for fun sake or a nobleman's etiquette. If it is accepted for fun sake then this episode of Shoorpankhaa may be considered to have some Haasya Ras (comic relief), in Raamaayan. Since Tulasee's Maanas says that she changed her guise in a beautiful woman, it is no more a Haasya Ras there.

[Taken from Valmiki Ramayan, 3/17]

After Lakshman cut her nose and ears, she went to her brothers, Khar and Dooshan and instigated them to kill those two brothers who had devoured her. She wanted to drink their blood. Khar and Dooshan were very brave and mighty and had many powers. They came to fight but were killed along with their 14,000 Raakshas army.

Then she went to her eldest brother Raavan in Lankaa, and said many instigating sentences about his living style and system of ruling. She knew that his weakness was woman so she intentionally mentioned about Seetaa and Her impassable beauty along the mention of those two brothers and advised him to have Her as his queen. As Raavan's spy had already informed him about the incident of Jansthaan, now he intended to abduct Seetaa. 

Thus in one way Shoorpankhaa was the instrumental for the abduction of Seetaa. if she had not gone to Panchvatee, she had not met Raam, Lakshman and Seeta; she had not been attracted to them; Lakshman had not cut her nose and ears, she had not called on Khar and Dooshan to kill Raam and Lakshman; Jansthaan had not been destroyed; Akampan (Raavan's spy) (in Raamaayan) or Shoorpankhaa (in Maanas) had not informed Raavan about Jansthaan and Shoorpankhaa had not instigate Raavan to abduct Seetaa. And he wouldn't know about their staying there.