[cloud9]

This is from my grammar workbook and I came up with an answer not in the answer key, would it be correct? It's to practice using せいか. I'm wondering if I need to include 'what' is over the budget, or if this is fine.

スミス：小林さん、足が出たせいかこのごろ元気がありませんねえ。
ハリス：ええ、私もちょっと心配していたんですよ。

Let's say I do need to include what's over the budget, would it be correct to say,
「小林さん、旅行が足が出たせいかこのごろ元気がありませんねえ。」