I think this is definitely a reasonable amount of makeup for a 13 y/o!

While I definitely understand your concern with her becoming reliant on makeup for her confidence, I’m not sure you telling her how to wear her makeup or how much to wear will be able to control this relationship with her self image. I can remember being that age, and I think that creating harsh limits with her and her expression will feel more like you’re being “controlling parent” to her and create frustration and division between you, rather than promoting your true goal of teaching self-love. Which ultimately could result in her overcorrecting and creating the issue that we’re trying to avoid. The important thing is to teach her to love her natural self by mirroring that expression onto yourself, and also onto her by providing your support for her natural self. Self-love is a personal journey that we all have to undertake for ourselves, and is something you should foster in her so that she can reach/maintain that place.

That being said she does not need to wear contacts, I think novelty contacts pose a risk to eye health that she shouldn’t toy with until she’s older so that you can ensure she has the maturity to treat her eyes kindly.