The context is this: two women are talking, with the first one (still unnamed)
that asks the second girl (Himari) if her trip with her boyfriend went well.
She says it was a very nice vacation and then:

> 陽葵の顔が、ぱーっと明るくなっていく。  
>  Himari's face was lighting up in enthusiasm.

The second woman smiles for Himari's mood swing, but I can't understand
exactly what the phrase means:

> その変わり様を、彼女は現金だとでも言うように軽く笑う。

The phrase seems to mean in a literal sense something amongst the line of "She
smiled for her change, as if it was cash", but I don't think that's the case.
Apparently "現金" in a -na adjective can also mean "calculating/self-
interested", but I'm not sure that you can construct a -そう-like phrase with
"とでも言うように". Any help?
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question
grammar translation syntax japanese-to-english narration
Question about 現金だとでも言うように
As it turned out as a result of our exchange in the comments, this question is
more about the meaning of the adjective 現金 than about とでも言うように.

As an adjective, 現金 is used to describe, often in a casual and non-accusatory
fashion, someone who easily changes their mood or attitude according to their
(often short-term) prospects of gaining something. They don't necessarily try
to deceive other people for their gains as the English word “ _calculating_ ”,
or even less negative “ _cunning_ ”, might suggest.

It seems the word 現金 began to be used in this sense in the Edo era in
reference to shopkeepers who changed their attitude, favorably, when they
learned that the customer was going to pay in cash, instead of deferring the
payment till the end of the month, or even the year, as was the norm at the
time. [Reference: [1](https://mag.japaaan.com/archives/128248),
[2](https://kashi-kari.jp/lab/howtolove-cash-person/)]

〜とでも言うように simply means “ _as if to say …_ ” The speaker smiled at Himari’s
sudden mood swing as if to say she (Himari) was 現金 because just thinking about
something good that happened to her, or the prospect of her relationship with
her boyfriend going well, suddenly lightened up her face.
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answer