She is looking good!
I hope things have been progressing well since your update here.
It's a difficult diagnosis for me to say with certainty what is causing those spots, but my guess is the culprit might be overwatering.
The increased heat can sometimes be a factor in the plants overall thirst but the type of soil and drainage level of the soil, as well as overall size of the plant and pot it's in are all important variables in determining the amount of water necessary throughout the day.
A good rule of thumb is to pick up the pot throughout the day and check the weight of it. If there is a considerable weight difference later in the day after watering, then she is demanding a lot of water, but usually this heavy of a demand does not come until mid flowering.
In the early life cycle of the plant, it might not need water for up to a week at a time, but as its root system grows and the foliage increases, the demand increasingly becomes higher.
At the plants current growth stage, one watering a day should be enough, unless you have a very loose soil compound with heavy drainage and airflow and are noticing a very considerable weight loss in the soil halfway through the day.
Usually foliage starting to turn from the bottom of the plant can also be an indicator that the plant is pulling nutrients from the foliage to use for the bud growth, a depletion that naturally occurs. When foliage shows issues from the upper part of the plant then it is usually more problematic.
It doesn't look like a serious issue. I'm curious to know how it's looking now since you wrote this post?
