Female Swordtail In 29 Gallon

[amcalab]

I'm going to have a 29 gallon tank with a large school of fish - (9-11 Rasbora or Dwarf Neon Rainbow). To contrast the school, I was thinking about a larger and brighter fish. A queen of the tank. Would a single female swordtail be OK in this scenario? Or would she be too big or too lonely?

 

[mesapod]

I think she would get lonely because when i got my female swordtail alone with 3 zebra danios she was messed up and wasnt eating or acting socialor anything