HI, thanks for using healthcare magic
If she is had her MMR injection already then
measles is not likely because this
vaccine will protect her against this infection along with mumps and
rubella.
If this not the case, then she may need to be checked to rule it out.
The cold symptoms may be related to the
teething but it may also be linked to the rash.
A rash can occur with viral infections and this is called
viral exanthem. This rash normally resolves with or soon after the infection.
It is treated only if symptoms are present eg itching etc
If she is unwell-- lethargic, not eating well etc ,then she should be seen. If she is otherwise active and alert then she may need assessment as yet unless you are concerned.
I hope this helps