yes its spelled Ms.allen or ms.williams.
Punctuation after Ms is optional. ======================== I disagree. Punctuation following Mr and Mrs is becoming optional, but I would respectfully submit that it is incorrect to place a period after Ms, because Ms is actually a word and not an abbreviation (as are Mr, for Master, and Mrs, for Mistress).
Open punctuation is used in The Economist, a highly respected English newspaper. However, in the United States, a period is almost always used after both of these abbreviations.
period
. a period
Period.
All sentences use punctuation, if only a period at the end.
Yes, you should include a period after the abbreviation "Dr." when it is used at the end of a sentence, in order to indicate that the sentence has ended. "Dr." is an abbreviation for "Doctor," so it functions like any other abbreviation in terms of punctuation rules.
No punctuation is required after the title Miss.Depending on your country, it is quite acceptable to have no punctuation after either Mr or Mrs as well. Australia, for example, no longer uses punctuation after titles.
That could be a period...
A period (.) is typically used at the end of a hypothesis to denote the end of the sentence.
period
period at the end of the sentence