I will concede that even if I can prove beyond a shadow of a doubt that Nympha was a woman I cannot prove that she was a pastor based on this verse alone;
15Give my greetings to the brothers
c at Laodicea, and to Nympha and the church in her house.
It is very possible that Nympha was a wealthy woman who had a large house and maybe even a courtyard which was common for the houses of the middle class and above in those days. It is possible that she welcomed the church to meet in her house and Paul is simply acknowledging her for her hospitality.
This could be the same if it was a male. We can't say that if it was a male he was the pastor but if it was a female she must have just been loaning the use of her house. That is a bias we bring to the possible interpretations.
Wouldn't it be wonderful if Paul pointed out a woman who specifically taught a man the Bible as a Teacher would a student, correcting their understanding and leading them into an understanding of Jesus more perfectly? Then everyone would know that it is fine for women to teach men the bible and they would realize they must have misunderstood authorial intent of 1 Tim 2:12 and that it is not talking about teaching men the bible. I have a feeling that even if we found such a verse an elaborate explanation would be invented using quotes from early church writers (some who's own salvation is suspect) that would explain why that verse does not mean what it says.
24Now a Jew named Apollos, a native of Alexandria, came to Ephesus. He was an eloquent man, competent in the Scriptures.
25He had been instructed in the way of the Lord. And being fervent in spirit,
d he spoke and taught accurately the things concerning Jesus, though he knew only the baptism of John.
26He began to speak boldly in the synagogue, but when Priscilla and Aquila heard him, they took him aside and explained to him the way of God more accurately.
27And when he wished to cross to Achaia, the brothers encouraged him and wrote to the disciples to welcome him. When he arrived, he greatly helped those who through grace had believed,
28for he powerfully refuted the Jews in public, showing by the Scriptures that the Christ was Jesus.
Priscilla here, as in other passages where she is mentioned is mentioned first and most scholars I have read believe this is intentional as Priscilla was the one called and operating in the ministry gifts and recognized by the apostles as taking the lead in teaching.
Give my greetings to Priscilla and Aquila, my co-workers in the ministry of Christ Jesus.
The churches of Asia send you greetings. Aquila and Prisca, together with the church in their house, send you hearty greetings in the Lord.
We can know that Pricilla and Aquila were both ministers of Jesus Christ and that Pricilla is named and included as such. We can know that she took Apollos aside and
explained to him the way of God more accurately. That is called TEACHING. And "in church" would have been in their house, so your not getting out of it that easy if you say she didn't do it in church. LOL
These scriptures and others like them help us to see that women were active in ministry that included teaching men.