You can try, but as someone else mentioned, if SLEC required additional testing, treatment or documentation outside of their two-day (average) process, then no. You will want 1 to 2 weeks between the interview and the medical.
LBC Delivery is 5 to 7 business days within Metro Manila. May be quicker if you pick it up at MOA, but that doesn't include the time it takes the Embassy to generate the visa.
Once she has completed her interview, she has to turn in her passport. If the Embassy puts her case in 221g administrative processing, once the documentation is available, her passport should be submitted with whatever the Embassy requests.
Please consider also she needs to depart the Philippines before her medical exam expires.