I haven't been able to get a response from ShiShi either.
Hopefully she's just taking some time off for the Chinese New Year next week. It will be disappointing if she's shut shop completely.
There are other asian options in Swansea, but I notice many of the vivastreet adverts are actually for the same operation and they seem to keep moving location almost on a weekly basis. They are in the Mount Pleasant area this week.