The 28-year-old golfer clinched her fourth runners-up finish at a major when Miyu Yamashita scooped victory at Royal Porthcawl, but she insisted she wasn't disappointed because illness had impacted her preparation for the tournament.
She told Sky Sports: "Listen, coming into this week I didn't think I was going to make the cut. That's the truth of it. I wasn't hitting it very well. I couldn't prepare as well as I wanted to because I was poorly.
"I was obviously collapsed three times in the round in Evian, and then still wasn't feeling well until Sunday last week.
"So I think I done pretty well, and considering my mindset coming into it, I'm pretty proud of myself."
Charley insisted she "really enjoyed" the tournament and was happy with her performance.
She said: "I really enjoyed it out there. I felt so in control of my game, and I know in my head I didn't hit - it's not like I whiffed a drive or whiffed a shot. I hit a good shot on 16.
"When I hit it that pure and the wind didn't take it, I just carry on thinking I hit it in a bunker. And then 17, I've hit a lovely shot into the green. It's so hard to hold that green. Like I don't know how you can physically - it's a lot of luck. Whether you hit it between five feet or 40 feet you can hit the same shot and it can land in two different positions.
"And then obviously missed that putt, but I hit it on the line. Like I didn't miss-strike it or anything. Then eight under pressure I hit a decent chip like over the bunker and stuff.
"I don't feel like I've actually mucked it up by mis-hitting any shots, which I think everybody can probably agree, you know what I mean? Like I played so solid."