Houlihan definitely doped. Check out this study.
Subjects that were injected with 150 mg nandrolone IM had PEAK levels similar to Houlihan(5ng/ml was their peak at 30 hours). The drug has <3% oral absorption. She would have had to taken a GIANT dose of oral drug to get her levels that high.
Maybe someone injected her without her knowledge, told her it was something else. But she's absolutely dirty.