that is so not transphobic. it is an observation. letting herself go means like, having a bad hair day or binge drinking. etc.
transphobic would be like, " I wouldn't want Caitlyn Jenner around my kids".
English
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Even "I wouldn't want Jenner around my kids" isn't, by itself, hateful to tran people
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you're right. it's more transphobic than what mr north said though