There are no definitive criteria in this for every case. However, the guardian must fulfill what has been entrusted to him by Almighty Allah by considering the welfare of his daughter as well as her natural need for marriage, even if such considerations do not go by the usual norms of society. Furthermore, he no longer has guardianship if his refusal will cause what is conventionally considered to be harmful for her.
There are many narrations that report that the Prophet gathered his household under the ‘Kisa’ – a cloak – which indicate clearly that the incident took place. The narrations are different in the exact wording. At the ending of the book of Mafatih al-Jinan, there is one version of this narration from some hadith books.
Simply desire to have it is not considered as insincerity, Riya, since Riya is when the action is with the intention of showing others. Having the prostration mark may or may not happen, so our advice is to ignore this issue and not focus on it.