The Bournemouth keeper made a number of crucial interventions at Loftus Road to help maintain their advantage after Kenni Thompson’s early goal.
She told the Daily Echo of her delight: “I haven't got many words, to be honest.
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“We spoke about making history and we've come out here today and we've done that.
“So I'm so proud, proud of myself, proud of the team and the staff, but like proud of the club and the journey that we've been on.”
Scadding said she was “really pleased” with her personal performance in the game.
Katie Scadding (Image: Antony Roveschi)
“Cup finals are the games that you want to play in, so I just told myself, be confident and do what we've been doing in training,” she said.
“And that's just happened today. So I'm really pleased for that. And obviously the defence as well, bodies on the line, not even just from defence, everyone throughout the whole game really got us over the edge.”
Argyle were held at bay for much of the 90 minutes, but saw more chances created in the closing stages as they sought an equaliser.
But Scadding and the Cherries team held firm and she said they knew what was needed to get the job done.
“We had a big chat at halftime about going into games 1-0,” she said.
“They were going to come out fighting and we knew we had to match that no matter the result. And we kept going to the end.
“I thought overall we were solid in and out of possession. So I'm really pleased that we managed to get over the final whistle with the win.”
(Image: Antony Roveschi)
Scadding did have a big collision with the post as she went for a cross in the final moments of the game which needed treatment – but she said she was alright.
“I'm not sure about tomorrow, but we'll leave that for tomorrow!” Scadding said.
“I don't really know what happened to be honest. I don't know if I got pushed, but the post wasn't moving. So yeah, but I'm alright.”
She continued: “[Sunday] is a day off to celebrate and a day off to recover.
“But we've got another big game next week. Every game now is huge for us. So as soon as we're back in on Tuesday, heads back on and we're ready to grind out the rest of the season.”