OK,
Although I invested more time than I wanted I found a solution that worked for me.
The Imagescan V3 driver seems to have caused all the hassle on the system.
- Researching I found that the Epson WF-2750 runs with the files of the Epson WF 2760.
Unfortunately, on the Epson driver website there is no driver entry for the WF2750 - one has to enter 2760 instead.
- I followed the protocol for the Epson Scanner setup from here:
(https://wiki.ubuntuusers.de/Scanner/Epson/)
I had to install the slxtproc file via synaptic first
I then downloaded the WF2760 driver here:
(http://download.ebz.epson.net/dsc/search/01/search/?OSC=LX)
Make sure to get the : iscan-bundle-2.30.4.x64.deb package!!!!
The Epson website sometimes shows the imagescan-bundle-ubuntu-18.04-3.59.2.x64.deb package which caused all the trouble and wasn't working for me.
It seems to offer it differently. When I tried to look for the deb package from Epson now - it would only show the (for me) non-working Imagescan3 bundle.
The only link I could find now was this:
http://support.epson.net/linux/src/scanner/iscan/
But then one would have to know how to create a package which I don't.
Maybe someone can add this to this discussion.
-
I used the > sudo sane-find-scanner< command to get my scanner data
-
According to the article I checked the iscan file in the appropriate folder as root . and >epkowa< was already an entry.
Since >epkowa< was entered I checked the epkowa.conf file - entered the appropriate data that I got from the >sudo sane-find-scanner< command.
Then I ran simple scan and now all scan programs work the way they should.
Whatever is wrong with this Epson Imagescan V3 driver I don't know - but it cost me huge amount of time and wasn't working properly at all - for whatever reason.
Now my step-mom is happy again since she can use the program she is used to 
I'll leave this discussion open until someone can maybe create the deb file from this source file package.
Thanks for the help, time and ideas of all involved.