I think my dear Rosie is stretching… last time I tried to give her more light she got sunburnt. I read she could need more light or less water. Any truth to this? Anything I can do to keep her happy and healthy?

If included before and after photos. The first one is from April 30, she's behind the tall boy (who is supposed to be tall). The last two are as of today.

More light. It's impossible to provide too much natural light indoors. The more, the better. Outdoor sun is a whole different thing, but indoors there is no danger of sunburning your plants unless they are coming right out of deep shade.

That may be the problem then, the care guide for that one said indirect sunlight. I'll start putting her in the sun a couple times a day and then eventually get into a really sunny spot.

Sounds good.

Fun fact: indoor sun is not technically direct sun, since regular window glass filters out much of the harmful UV portion of the spectrum.

This effect helps explain why indoor sun is kinder to plants, and why indoor plants typically require a gradual stepwise introduction to direct (outdoor) sun, usually over the course of weeks, before they can build up the UV resistance to tolerate it well.

When moving toward outdoor sunlight, will they be able to tolerate a quick temperature change? I like to have the house pretty cool.

If you allow the plants to adjust to temperature first, and then light, it should not be a problem. (Maybe a week in bright outdoor shade for starters?) If you force them to deal with heat and sun all at once, maybe things do not go as smoothly.

Does NOT look sunburnt.