She doesn't know *how* to play bridge

Jenn Platt:

[whispers at the top of the stairs, holding her mom's glass]
Try this. Taste it. Marti Malone:
[takes sip]
It's water. Jenn Platt:
That's right, it's water, there's always vodka in this glass. Marti Malone:
Well maybe she went on the wagon. Jenn Platt:
No, if she went on the wagon she'd be climbing the walls by now. Mrs. Platt:
[calls up the stairs]
Jenn, I'm leaving now. Jenn Platt:
Where're you going? Mrs. Platt:
We're going to play bridge at the Smythes. [leaves with other women] Marti Malone:
[Jenn shoots her a look]
What? Jenn Platt:
She doesn't know *how* to play bridge