Use "after [gerund]" or "after [clause]". How would you correct your sentence?

You are confused because "after" can serve as two different parts of speech: preposition or conjunction. As a preposition: after breakfast, after 10:00 in the morning, after seeing her (yes, use "ing") As a conjunction: after (subject)(verb). After she is feeling better/after she feels better (in this case the clause after "after" is written just like any sentence would be written)

You can't use a pronoun like "she" directly with a gerund/present participle like "feeling". If you want to use that word as a gerund, then you can't have the "she", and the sentence becomes "I am gong to tell her the news after feeling better". But that then would be you rather than her we are talking about. (And in any case, that expression is a bit unnatural, because it has to do with your condition rather than an event, but you can consider phrases like "after getting home" or "after eating dinner".) If you want to use "feeling" as a present participle, then you need "she is". Otherwise "after she feels better" is fine, and probably the simplest solution here.

after position (in, on, after, ...), you must use gerund verb or clause. about your ex, you should use "she feels" because subject "she" starts a new sentence. when two or more subject of the verb are likely, you can omit this subject and turn verb into gerund :)

...after she feels better or ...after she is feeling better are both correct and their meanings are similar. :)