New PacMan Owner needs tips on maintaining humidity

[Zessinna]

Hello! I have a new frog named Henry. Had her for 2 days.
I'm very excited to have her, but I noticed that I'm having trouble keeping the humidity high enough for her. Right now, it's sitting at about 50%. According to PetSmart, that is the bare minimum, but that doesn't mean it's good.
The thermometer is just above where she hangs out (as seen in photos below), and she has been burrowing, so I like to think maybe she is self controlling her humidity? But I want to make her comfortable outside of the dirt too.

After reading other forums, I noticed this information is suppose to help.
1. Size of enclosure: I think it is 5 gallons, but exact measurements are 16 inches long, 8 inches wide, and 10 inches tall.
2. # of inhabitants: She is solo and about 2 inches long.
3. Humidity:Hovering slightly above 50%
4. Temperature: 82 fahrenheit
5. Water - type - for both misting and soaking dish: I just bought the water conditioner, so it's a mix of filtered water and conditioned water.
6. Materials used for substrate: Coconut fiber and there are bits of moss around the edges
7. Enclosure set up i.e. plants (live or artificial), wood, bark and other materials.: There is a half log, and a shallow pool.
8. Main food source: Crickets
9. Vitamins and calcium? Currently, it's just crickets that eat this green cube thing. Idk what's in the cube. But soon I will purchase calcium.
10. Lighting: A heating lamp on one side, that is at 10 watts (small tank, so low wattage)
11. What is being used to maintain the temperature of the enclosure: The heating lamp and I have placed aluminum foil on half of the top of the tank.
12. When is the last time he/she ate: Today, a few hours ago. One cricket
13. Have you found poop lately: No. But she peed on my hand.
14. A pic would be helpful including frog and enclosure (any including cell phone pic is fine) Photos will be below.
15. How old is the frog: I'm not sure, but internet says a few months.
16. How long have you owned him/her: 2 days
17. Is the frog wild caught or captive bred: Captive
18. Frog food- how often and if it is diverse, what other feeders are used as treats: Crickets, at the moment. We will try small fish in the future.
19. How often the frog is handled: So far, 2 times for maybe 7 minutes or less.
20. Is the enclosure kept in a high or low traffic area: Umm.. I consider it low traffic, but I check on it often to make sure the humidity isn't falling too low.
21. Describe enclosure maintenance (water changes, cleaning, etc): Since I've had it for only 2 days, I have not cleaned it. Day 0 (day we got her) I put water in the dirt with filtered water, and sprayed the top as well. Yesterday I put more water (about 1 1/2 bottles of water in the dirt), and today, I put about 1 bottle of water (conditioned) in the dirt, and sprayed the top a lot in attempt to make the humidity higher.

Thanks in advance for help and tips!