Brit Speak: Child in a Highchair Drinking Tea?

[Steve]

I was on JKR's website, in her Biography section and she is discussing
when she first heard that her book would be published. In it she said
something strange, and I wondered if people who are familiar with
British language and culture could tell me if she likely meant this
figuratively or literally.

"...It's definitely going to be published?' After I had hung up, I
screamed and jumped into the air; Jessica, who was sitting in her
high-chair enjoying tea, looked thoroughly scared."

When she says '...enjoying tea...' does she mean that a child young
enough to need a highchair was literally drinking tea? I know tea is a
great part of British culture, but isn't tea for an infant a little
too much. Or, did she mean, as I greatly hope, that the child was
having a snack?

Of course, not being there we can't say with absolute certainty, but
certainly someone who is knowledgable in British language could give a
likely meaning.

Just curious.

bboy_mn