It may well be a weave but to all the people saying it's impossible for it to be her natural hair because she'd be spending hours straightening it - once you get African hair relaxed at a decent salon, straightening it isn't that much more difficult than straightening non-African hair, since only the regrowth will require more effort.
source: wife is Ethiopian. Got her hair relaxed late last year. Now straightening is a 15 minute job.