Marina had some huge results in Fed Cup this year. She beat Wynne Prakusya (ranked in top 200 at the time) and lost 9-7 in the third set to Suchanan Vitrapesert (who was ranked just inside or outside of the top 200 at the time). Those are great results for any 15 year old, and clearly New Zealand tennis officials are shitting themselves as they don't have anyone else with the slightest possibility of top 250 singles potential.
She also just got smoked by Alexa Glatch in the 2nd round of the Orange Bowl (big junior tournament yesterday) so inconsistency may be her big issue. Either way she doesn't have a prayer at winning a round unless she draws another New Zealander or a lucky loser (I don't think she could beat a qualifier at this stage, or at the very least would have to be at her absolute best to do so), but hopefully she puts up a good showing and shows what she can do in the future.