The entire tournament has been affected by the weather, and Friday's match was reduced to 23 overs a side.
Ireland were put in and were all out for 28 in 22.1 overs. Legspinner Bismah Maroof did the most damage, taking 4 for 7.
Pakistan chased the total in 13.3 overs, with Javeria Khan scoring 47 not out. Sri Lanka women finished second in the table after registering an emphatic eight-wicket win over Netherlands women.