That's a pretty girl!
I kept my first female betta with a pair of guppies and an otocinclus in a 10 gallon tank. They did pretty well together, but the female guppy was suddenly thinner one day and I didn't see any fry at that time, so they may have been eaten if Jill was pgregnant. Opal th betta died the day after I bought a few more guppies from a LFS and they wouldn't even refund the guppy that died and probably made opal sick. I haven't done business with them again. Since then I have tried female bettas in my comunity a couple of times. The first time my bettas got sick or injured almost imediately and didn't last long, but Betty stayed in the comunity for a while. She was kind or the boss of the whole comunity. Then I let some female guppies visit and she didn't like the one that had a tail bigger and brighter than her own, so she trimmed it down to size and otherwise terrorized the guppies until I sent them back to their own tank. My cousin had a male betta in her comunity and the other fish tore his fins up. Pet stores have told me that female bettas are comunity fish, but males are not.
Your answers will vary. If the other fish aren't too flashy and don't atract the betta's attention, they might be OK if the betta is not a very agressive individual. If the other fish are agressive or even very curious and active, there could be problems, and of course the other fish need more aeration and filtration than a betta alone. Your small tank sounds like one of mine that is only about 2 to 2.5 gallons. If you go by the 1 gallon per inch of fish rule, you really don't have room for roommates anyway.