If you are worried you can feed 3 meals a day, but I'd go back to twice a day in about a month or so.

I'd say she should be eating about 3 cups a day at this age, increase it slowly as she gorws, she may be up to about 5 cups a day in a couple months. Once she starts to stop growing you should feed a little less again.

When I got Kaige, he was 10 weeks old and was fed twice a day and got about 2-2.5 cups per day, but thats a slightly smaller breed than a lab/golden.
I know by the time he was 4 months of age he was up to 3 cups/day.
I tried feeding him 3 meals a day at 10 weeks of age but he wasn't finishing all of his meals in under 20 minutes, it would take him about an hour to eat his breakfast. When I started feeding him twice a day he started finishing all of his meals within 20 minutes.

BUT what kind of kibble do you feed? If it's Pedigree or another not so good brand you'll need to feed even more.