Former DUP MP Ian Paisley antecedently told the BBC helium saw Donaldson "blindingly drunk" during a St Patrick's travel to Washington.
However, Little-Pengelly said she did not spot thing that made her deliberation Donaldson was a hard drinker.
"I tin accidental manus successful my heart, I didn't spot thing that made maine deliberation that determination were immoderate issues successful presumption of problematic behaviour successful regards to drinking oregon successful presumption of sexually inappropriate behaviour," she added.
"If immoderate person was moving astir acting successful that way, I deliberation it would person been the speech of St Patrick's successful [Washington] DC amongst the many, many, radical from Northern Ireland that spell retired there.”
Little-Pengelly said she finds it "astounding that radical haven't been talking astir that for the past 20 years".
She said Donaldson would person had a solid of vino astatine events but she ne'er saw him drinking excessively much.
"On immoderate of this different stuff, look, I don't cognize whether immoderate of these allegations are existent oregon they're not true.
"All I tin accidental is that I ne'er saw problematic drinking from Jeffrey Donaldson.
"If anything, Jeffrey Donaldson was idiosyncratic who seemed to enactment each of the time."
The afloat BBC Red Lines interrogation with Emma Little-Pengelly is disposable present connected BBC Sounds.
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