Will she hang on for another 3 weeks?

We have 3 weeks left until our last frost date here in Scotland, and she still needs to be hardened off. 1 set of flowers so far (had pinched off another previously), with 3 or 4 more clusters of buds. (I decided to let one sucker grow but have pruned the rest). It’s sitting in “young plant” compost right now as it’s my first time growing and I didn’t realize there were different kinds. 😅

It will ultimately go into a 20 or 25 litre container on the balcony, into compost from a grow bag.

Do you think it will be ok to leave her in the current pot (20 cm wide) for another 3 weeks? The lower branches seem so droopy to me. I don’t see any roots coming through the bottom yet. Should I fertilize a bit?

Thanks in advance!