AMAS - Anti-malignin antibody screen test is designed to pick up cancers well in advance of other signs and symptoms, months before conventional medical tests can detect it. However, for advanced cancer, if the antimalignin antibody is wiped out, the test won't work. For this, other types of testing is recommended.
No. Swimming immediately after eating isn't dangerous, but it could result in uncomfortable stomach cramps. Parents have long advised children to wait at least 30 minutes after eating before going back into the water. You may have been told that's because swimming with a full stomach can cause severe cramps and lead to drowning. But there's no evidence to support such a warning.
A slow five minute walk will not hurt her. But, definitely NO overexertion, no running, no jogging, no jumping... nothing more than a short/calm walk after eating, unless you wait for at least 2-3 hours after she feeds, before doing so. As a rule, don't feed for an hour after coming in from exercise (and that includes a long car journey, to allow the system to settle down), and leave it 2 hours after feeding before exercising.