Native HANA : Bring all the data from SAP/NON- SAP sources to HANA DB using SLT/BODS(ETL tool) and perform modelling on top on HANA DB and perform the reporting on top of HANA DB.
Native HANA means in general that the code has been developed on HANA and specifically for HANA. For example BW has coding which can run on all databases which are certified for BW, and new code developed specifically for HANA = HANA native. Or another example, HANA studio is a native HANA application
Native HANA means it is something build on top of the HANA BOX and it can have the full HANA performance and benifits and there is another term called non-native HANA applications which means the developments done using other technologies can also run on top of HANA, like .net, java applications.
Native HANA : Here we do the data modeling by using HANA studio. In this case HANA will be used as database and ETL as well.