Scene 1:I think it was an accident. The tree branch fell suddenly and was beyond her control, so it was not negligence.
Scene 2:I think it was likely negligence because blood and a fingernail should never be in food. However, a full investigation is needed before making a final judgment.
(the owner/manufacturer) is mainly liable because the company produced the bot. My precaution would be to require proper testing, safety checks, and regular maintenance before using the bot. Tagged