Upon further examination, it appears that she also has some ulcers inside her mouth. She did not have any fever and was still her normal self (thankfully!) and will be put on medication (that one bottle of medication - some kind of acid - only costs less than RM5!!) and allowed to get well on her own. It is a viral infection anyway, caused by the Coxsackie virus. So, no need for antibiotics. Just need to drink lots of fluids. Actually, this is her second bout with this virus, the 1st time being 2 years ago. Then, it was also mild and there were no blisters but only the presence of ulcers.
Now, she is placed in grandpa and grandma's care to keep her away from the kids at the child care. I am sure she will have a good time with them after being in child care for a week. Hopefully, her younger sister is strong enough to keep the bugs at bay. We will just have to monitor for signs.