At 11 weeks pregnant to be told it was an ectopic she would have needed surgery to remove it.its not possible to carry an ectopic this far,without serious consequences to your girlfriend.obviously she had a miscarriage at some point,possibly a missed abortion.when in early pregnancy the pregnancy stops and dissolves in the body,and she indeed got pregnant later after.its impossible for her to carry a baby for 16months.
I just answered your other post, but if she had an ectopic pregnancy that means the fetus implanted in her fallopian tubes rather than in the uterus. Its not possible to carry an ectopic pregnancy to term, so the baby she delivered in April would have been a second pregnancy.