“Sorry for late reply . Hena usually has football on Fri evenings but I know she will def want to miss it to join Helen’s celebration! Thank you!”

Is this mean she can come to join Helen’s party?
Makes me confused whether she can come or not.

Please answer the meaning of reply.

Question

“Sorry for late reply . Hena usually has football on Fri evenings but I know she will def want to miss it to join Helen’s celebration! Thank you!”

Is this mean she can come to join Helen’s party? 
Makes me confused whether  she can come or not.

Please answer the meaning of reply.

Answer

Yes, she is going to Helen’s celebration.

Answer

Well, the reply actually is a little confusing. The person (maybe her mom?) is saying that Hena has a conflict with the party (her football practice), but she is confident that she will choose to go to the party instead of the football practice, although she has not actually asked her yet.

So the answer of whether she will come to the party is: probably :)