Title more or less. I’ve got her sitting at SL 99 right now with 24 vigor, 30 attunement, 24 endurance and 60 intelligence. I was going to go 30 vig with 40 att before calling it but, should I drop more points into intelligence instead?
Your Intelligence is already at softcap, there's no reason to go any higher. You'll get next to nothing for going over 60. Refer to this chart to see the difference.
I'd strongly suggest 40 Vigor, because that's the point where late-game and NG+ bosses stop one-shotting you, not to mention it's also how much you need to survive at least two hits from every weapon in the game (Strength builds in particular). Since nearly all weapons guarantee two hits on their R1s, that's a pretty important difference.
I don't recommend going over 30 Attunement, for two reasons: 1) Your Ashen Estus only recovers 200 FP per use, and you already have slightly more than that at 30att, and 2) You'll come to find that 5 slots is not only plenty, but borders on more than you need, especially for sorcery.
Just my thoughts.