Buds!!

Yes that's normal, it means you are getting close to harvest. I recommend you to look up the visual cues of when a plant is ready to be harvested + how long to dry + how long to cure.

many potential causes... a foliar spray used could potentially burn pistils. If it got knocked up by some pollen, it would turn color early. Too much light would cause the pistils at top to turn earlier than rest of plant -- in a more obvious way than the normal top-down development. Check for nanners can easily quell fear of seeds. be careful of anything you apply to foliage at this stage. if only at top, maybe raise lights an inch or 3. could just be "time" ... it's gotta start at some point and each plant can be quite different how it progresses. Seen some that looked like bud by week 6 with plump calyxes... and still take another 3-4 weeks to finish. Seen some that develop at seemingly light-speed in last few weeks too... with only white hairs just before that with little plump. What i see is a healthy plant... you've got a lot more intimate knowledge to eliminate the possibilities.

Depends on the week of flower she is on. I would be concered if i started to see pistils changing colour before say week 4 or 5 of flower this tends to indicate the plant is in the early stages of pollination. Meaning you need to get her out of dodge. My advice Thouroughly check every single plant in your tent for any signs of male reproduction pollen sacks they tend to be on the main stems but can hide anywhere if you have fully checked that there are no male pollen sacks then it can be normal but when they turn early its often a bad sign in my experience anyway. Sorry to be the bearer of bad news and it may be normal for that pheno but just look and inspect every plant. This is why i tend not to mix strains in the same grow area if one is a bad pheno and herms you have lost the lot. Best of luck anyway bro and I hope she is just a early finisher :P 👊

Yeah it's fine. Nothing to be worried about