Somehow these are all tied up

We have Edwin G marrying Rosa C on 15.11 1884, then no details of his death can be found as yet that are convincing.
We then have details of Rosa C marrying Fidelis(Patrick) Tighe on 9.12.1895, as a widower!!
The it appears that Fridelis may have gone to New Zealand in 1916 to live with his father at 5B Paget St. Auckland. Fidelis appears to have had two brothers John and Patrick. So no details of a divorce here but there brs a Fidelis died in 1931, aged 61 which could be the death I am looking for.
Has Rosa then married a Frederick Partridge, I have no date of marriage except to assume it is after 1895 but feel it may be later than 1899.
Did Rosa ever get divorced at all, did she use slight corruptions to her name when she remarries, or drop one of her names. Was this common practice to be somewhat economical with the truth.
It would be immensely satisfying to try and tidy up this bundle.
If anybody can fill in gaps I would like to hear. I am not on Ancestry .com as yet so am limited.
Thank you.
Colin.