I searched and found some more information about this play and it proved to be a very exciting find and I felt thrilled by knowing the actual (and complete) story. What this ACK presented is only about 20% of the whole play.
The story of Udayan and Vasavadatta was well known and very popular among the general public in ancient India.It was made the subject of many plays and poems of that time. But most notably the great playwrite "Bhasa" compiled it in his greatest classic named "Swapnavasavadatta". Later other writers like Subandhu worked on the same theme and produced their versions of the story. During 5th century C.E., it appeared in Pali and Prakrut languages and it was present in Dhamma-pada-atthakatha. This ACK is based on this last source only.
Dear Aditya, for answer of your question, read the following paragraphs where Bhasa's "Swapnavasavadatta" is presented in condensed form.
So this clearly suggests that King Pradyotha had accepted Udayan as his son-in-law. We also get to know the reason why "Vasavadatta" was chosen as title. Really thrilling tale of great sacrifice by her though finally everything settled well.