✔ 最佳答案
The sentence is correct!
A comma splice means two sentences, with full verbs, are joined by a comma.There is no comma splice in the above-said sentence as there is just
----> One main clause + one participle phrase
In fact there is only one verb, 'did', in the sentence. The main clause is : She did really well at school.
The second part of the sentence is a participle phrase: "coming top of the class again this year. (originally = she came top of the class again this year------> "she" is left out, and the verb "came" becomes a present participle"coming" which is no longer a full verb!)