I have no experience growing with compost. Iv read/herd somwhere, as I must have to think this lol, but compost is not recommended. What is recommended, is using Perlite, Vermiculite, some lime, some blood meal, and some clean nice dirt. This all helps to keep your PH stable as well provide great water drainage and an extremely easy growing medium to grow threw.

Cannabis plants are stupidly sensative to over watering and having to work hard. They are a lazy ass plant lol. Iv seen ppl grow using only perlite and vermiculite. The roots just slide in between and you do get some water holdage but mostly it drains, why you use a bit of dirt.

Personally I use Schults and MG soils that have nutes, only gives a little burnt tips, again sensative girls they be, but i mix about half perlite and half dirt, it really does make a world of different in seedlings and it usually lasts me up until I start my flower cycle, at least as I can tell as I then use Schults SUper Bloom 10-50-10, I use it at 1/4 str as its bullshit bloom fertilizer lol, helps somewhat but once I stop for my last 2.5 weeks of plain water, you can tell how the leaves yellow up as its not getting its food from the dirt but from itself.

I would suggest, if you can, germinate another seed or once you can, take a cutting and root it, and use a small beer cup or small styrphome cup with the compost. Prolly will have to add nutes but I wouldnt dare just dive in on the transplant with the compost until you know its not just nasty shit lol. Just my .02$. Wouldnt want to stress her so bad that she herms when what your using is working fine.