healtyh sative 3 ft, how do I support her top safely shes top heavy and leans bad lol

First off I'm growin indoors, so my stems are weaker then if she was outside, I got a couple indicas as well but there a third of the sativas size. THey are all healthy and the same age, about 80 days from sprout now, just introduced them into flowering. The sativa needs some added support for her top though because shes got a nice top bud growin there and shes leaning ha ha. I'm just wondering what would the best way be to give her some support safely. her stem is strong up until about 3/4 of the way up then its real soft up there so she could benefit from a bit of help lol. I also got lights just above her so just tying a string to her is out of the question. Sorry but I cant post any pictures because of a goofy server problem.

Find a proper size tomato cage or use large wire fence wrapped around it. You'll find either at the home centers but it might be a little late in the season for tomato cages.

Problem is if you just started to flower she's going to get taller so expect it, get a taller cage.

Thanks for the advice man, but I just used a straw glued to a thumbtack attached to the wall to give her a bit of support on the top, so far its working quite well.