I'm not sure whether the last line is supposed to be connected to this one. If not, then write "an understanding" rather than "this understanding." It's a bit unclear because what is to be understood seems to be a question.

She wished for joy, on shooting stars at night!
And for no pain in any hearts to stay.
And for an understanding at first sight:
Was she so strong? Or did it seem that way…

Ей так хотелось счастья - звездопада!
И чтобы боль в сердцах не оставалась.
И чтобы понял кто-нибудь по взгляду
- Была ли сильной? Или же казалась…