I met up at her home address.
Is this grammatically correct?
' rather than 'I' unless you are referring to meeting up with someone else - not 'her' - in which case you'd use 'I met up with [John] at her house'. This assumes you've previously established the identity of 'her' to allow the use of that determiner in the sentence.
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You really need 'We...' rather than 'I' unless you are referring to meeting up with someone else - not 'her' - in which case you'd use 'I met up with [John] at her house'. This assumes you've previously established the identity of 'her' to allow the use of that determiner in the sentence.
You don't really need "up" or "with" after met or meet. Some people add those words despite the fact that they are superfluous.