Doubt she bothered with a divorce - maybe Fred Watkins/Leonard was deceased by then, or maybe she (correctly) guessed nobody would be able to check/prove that she hadn't been widowed, married to George Ingleton, and then widowed again. Not at all uncommon - especially as there was an ocean and thirty or so years between her first and last (second, third?) marriage.
At emigrated in 1911 she is under her maiden name but "married". As you say, by 1913 she is travelling with George and is "Mrs Ingleton". It seems that they were in the same theatre troupe - here they are mentioned in 1912:
http://www.rootschat.com/links/018be/It looks like they toured around a number of places so a small chance exists she did marry George somewhere along the tour route (not all US marriages are easily searchable online).