Sorry this has happened. It must be a shock.
I joined 23andME when it first started hoping to learn more about health but the most rewarding bit has been helping people who contact me trying to find their place in the family.
Some know that they are adopted but for others it's been a shock to see a whole lot of matches to names they don't recognise.
My male ancestors were seafarers and some really did have a girl in every port.
Because they were away at sea for long periods of time they could even come back home to another baby and it appeared to be commonly accepted.
One person contacted me to say that it solved a family mystery. Their GM had been widowed and married again and it appears that all of her existing children were related to husband 2. They were never told though.
It can take years of waiting though until someone related gets tested and the results suddenly appear and make sense.
That's why some people upload their data to as many websites as they can.
One adopted daughter waited 8 years until a close match finally appeared.
There are tools that can be run on the data (from different sources) to calculate possible relationships. I'm rusty on this now sorry.
If the target family comes from an area that the population is stable and everyone "knows" their family tree then it could be a wait for someone to test and supply answers elsewhere.
That's why the detective work may need to be closer to home. Holidays, family friends, italian businesses close to where she lived. Local directories and records. Local Facebook pages. School photos.
I note on my own % that the geograhical areas keep changing (only roughly) every time the website(s) update their data. Also their guess as to when these ancestors contributed genes. It's an ongoing process as more people worldwide get tested.