You can put her in a shower for like 10-15mins. Make the shower head hits the wall and the water mist will hit in her direstion. You can also add a couple of mistings which will up the humidity to aid in her shed.
Last option, you can try a wet Q Tip and see how that works.
Congrats on your cham. Everything sounds good. From the pictures, I want to say Female because the lack of a buldge. But the pattern is throwing me off.
Are you sure the cham is 4-5months old already?