Yep I would definitely guess 4a/4b with some little 3c curls mixed in there.
Thick, highly porous but protein sensitive 4a hair
Modified Curly Girl Method

Current Staples
Cowash/Rinse-Out: Jane Carter Solutions' Healthy Hair Cowash
DC: Eden Bodyworks Jojoba Monoi DC/Maui Moisture's Shea Butter Hair Mask
Leave-In: Maui Moisture's Curl Milk
Stylers: Maui Moisture's Curl Smoothie and Shea Butter Hair Mask
Sealants: Maui Moisture's Coconut Milk Weightless Oil Mist