You may wanna let her go to day 40. Some plant are just slow growers.

Remember you only get buds from growth tips.

At this time, she only has one.

But hey, sometimes thats all you want

BTW.... I notice the white card covering the soil base. Good idea.

However, I can see leaf shadows which means it isnt working. You need some more lights and side lights on her.

Good luck friend.