If they wanted Parvati to be weak & feeble, the perfect opportunity for that was last night when Dhoomralochan & co approached her. In the original story, Ambika pretended to be helpless, while saying to them that she had taken a vow to marry only the one who could defeat her in battle. She didn't roar & burn them - she just did a hmmm & burnt only Dhoomralochan. And she kept pretending to be weak & feeble even as she kept invoking first Chandi, then Mahakali.
So assuming that the CVs have a fetish for a weak & feeble Parvati, they could have shown that original story, w/ her as Ambika, and they'd have gotten exactly what they wanted. And since they didn't kill even Chanda or Munda, they wouldn't have had to show Ambika strong either.
On the bright side, however, she does boss over the Ganas, which is a good starting point.
There is one justification I can think of here for showing Parvati as too gentle (although it doesn't jive w/ her image as either Mahakali or Ma Durga). It is that when Ganapati was beheaded by Mahadev (now, that depends on which version they show in the serial - I'm thinking about the Shiva Purana version here), she became enraged and invoked both Ma Durga & Mahakali and sent them on a rampage against the Devas & Ganas. So, they could be trying to show that when it was just her, she was meek, but when it became a matter of her son, she had a total meltdown. That is the only pretext for which I think they could be justified in showing her as meek now - so that the contrast would be glaring when she resolves to avenge her son's death.