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"развилAсь" is inacceptable completely. If you say "развилAсь", everybody would hear "развeлAсь" which is different word.

I can remember "прижилАсь". It is correct as well as "прижИлась" but maybe...

Sometimes this preposition with the next word can be pronounced like one word with stressed preposition. I.e. "По лесу" can be pronounced as "полесу". But this way of pronunciation is not really...