This is a case we encountered while back.

Patient RH neg and antibody screen negative. No Rhogam given this pregnancy. at 26 week specimen shows 2+ to 3+ anti-D and ficin panel shows anti-E (heterozygous cells enhanced 3+ with ficin). Tube screen (LISS enhancement) negative. Repeat specimen after two weeks same strength with gel and tube week positive at AHG phase with 30 mins incubation.

It looks like allo but strength is same after two week and too many questions here?????

Wild guess here, but did she get RhIG somewhere else?

 If RhIg not given in this pregnancy than it might be silent fetomaternal haemorrhage and lady might developing allo anti-D in this pregnancy. We had a similar case where antibody screen was negative at booking blood and all of sudden antiD level shoot up at 28 weeks.