I didn't even think of Nexis... How dim-witted of me.
Hmm, I thought it was called the Tortona tournament because it was in Tortona, not Rome... "The Italian club team" - very informative. At least it mentioned the nationality of the other representatives, which might give some input for further research in German or Portuguese. I would guess it was a 6-team tournament with 2 groups of 3 (West German, Brazilian, Chinese, Swiss teams + 2 Italian teams), but that might be wildly off the mark.
The tournament in Venice was the 1986 Mundialito in Jesolo (Venezia province), which is documented on RSSSF. Given that Brazil played in this, there is a good chance it was the Brazil NT in the Tortona tournament as well, considering it began about a week after the Mundialito ended. However, RSSSF Brazil mentions nothing of this tournament in its detailed account of the women's national team.