Anahi Sanchez wasn't backing down though, she landed a number of blows on Taylor.
All three judges scored the fight as 99-90 as Taylor claimed her first world professional crown.
The pair are set to compete over 10 rounds on the undercard of Anthony Joshua's world heavyweight title defence against Carlos Takam.
Biggest night of my life and it's been a big learning curve for me.
It is understood that a homecoming in Dublin is in play for 2018 as is an increased presence in the U.S. - of which over 30 million Irish-Americans call home.
The 26-year-old tipped the scales one pound over the limit and was given a further two hours to successfully make 9st 9lb but could not do so.
I like what I seen from Katie Taylor tonight.
Either way, the 31-year-old former Olympic champion has claimed she is only concerned about what transpires in the ring.
Taylor snapped back Sanchez's head with a right hand in a corner with about 50 seconds to go in the fifth round.
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The cut above her eye failed to deter her late on as a five-shot combination found the target in the ninth.
For those who know who RTE are, Irish in Ireland and the many more Irish around the world, the above might come across as a tad ironic.
"Even when she got the knockdown, you look at her face".
Taylor will have options, but once again showed how comfortable she is on the big stage as she completed her rapid ascent to the top of the pro game and built on a glorious amateur pedigree.
It is not yet certain whether Sanchez may have to forfeit a portion of her fight purse to Taylor in order for the fight to proceed.
But throughout the contest Taylor had the edge in power and variety.
She took a moment to savour her win afterwards before immediately planning for the future.
But there were signals also of the dangers at the highest level. That can only have added to her marketability.
"These are the sort of fights that are going to elevate women's boxing".