Greetings,
mishiree - and congratulations to you !!
Regarding women's long hair, I've seen
I Cor 11. Propriety in Worship referred to:
"5And every woman who prays or prophesies with her head uncovered dishonors her head—it is just as though her head were shaved. 6If a woman does not cover her head, she should have her hair cut off; and if it is a disgrace for a woman to have her hair cut or shaved off, she should cover her head."
"14Does not the very nature of things teach you that if a man has long hair, it is a disgrace to him, 15but that if a woman has long hair, it is her glory? For long hair is given to her as a covering. 16If anyone wants to be contentious about this, we have no other practice—nor do the churches of God."
Clearly there was an issue in the church at the time that Paul was addressing - but we are not given how long the hair should be. He speaks of a woman's shaven head (or hair "cut or shaved off") as a disgrace, but does not prohibit any cutting of it.
...so in short, most Christians do not read a Commandment or Doctrine here.
Let me leave you with this:
Matthew 22, The Greatest Commandment:
"36"Teacher, which is the greatest commandment in the Law?" 37Jesus replied: " 'Love the Lord your God with all your heart and with all your soul and with all your mind.'[b] 38This is the first and greatest commandment. 39And the second is like it: 'Love your neighbor as yourself.'[c] 40All the Law and the Prophets hang on these two commandments."