This is an interesting situation described by Maria, although I think it is quite common. I have myself attended many marriages where the question was asked only once (though I think, asking three (3) times is Sunnah and Masnoon (recommended)). However the wordings used by the moulvi to ask the girl were quite wierd. I agree with NYAhmadi that usually it is a family member, uncle etc, who goes to the bride, instead of the moulvi. The recommended words to be used are:
"(Bride's name) daughter of (her father's name) ka nikah (groom's name) son of (groom's father's name), ba'iwz (description of haq mehar) kay saath tai paya hai. Aap ko qabool hai"?
ba'iwz - means "for the value". It is masnoon (recommended) that the amount of mehar be given to the bride before the marriage is consummated, although any other sort of agreement for payment of mehar is also allowed, by agreement of both the parties. Popular kinds are "Mu'ajal", "Ghair Mu'ajal" and "Indat-talab" (On demand).
The same wordings are used for both bride and the groom. However the acceptance of bride is usually not on the main stage, in Pakistani custom. In some families, the bride has to clearly say the words "Qabool hai", and in some others, if she merely nods her head, it is considered sufficient. The groom, however, has to clearly say the words "Qabool hai" (I Accept). Usually, the groom is not allowed to say "Yes" or to nod his head in affirmation, unless of course he has a physically challenging health problem.
Signing the Nikahnama, also called Document of Marriage is a legal requirement as per Family Laws of 1962 applicable in Pakistan.
Leading dua for the newly married couple is also masnoon and sunnah, although it can not be categorized as fard, or mandatory. It is, however, highly unusual not to offer dua after Nikah. Although it is highly possible, that the dua is offered after the groom has also accepted the nikah and has signed the papers. You must note that the acceptance of bride is taken first and acceptance from the groom is taken afterwards, so dua is usually offered after the nikah is COMPLETE!
In any case, if both the bride and the groom signed the nikahnama and there were proper witnesses to the act, then there is no reason to doubt that they are married and it is alright.
Adios!